diff --git a/swh/web/common/converters.py b/swh/web/common/converters.py
--- a/swh/web/common/converters.py
+++ b/swh/web/common/converters.py
@@ -6,11 +6,11 @@
 import datetime
 import json
 
-from typing import Any, Dict
+from typing import Any, Dict, Union
 
 from swh.core.utils import decode_with_escape
 from swh.model import hashutil
-from swh.model.model import Release
+from swh.model.model import Release, Revision
 from swh.storage.interface import PartialBranches
 
 from swh.web.common.typing import OriginInfo, OriginVisitInfo
@@ -258,26 +258,11 @@
     return json.loads(json.dumps(metadata, cls=SWHMetadataEncoder))
 
 
-def from_revision(revision):
-    """Convert from a swh revision to a json serializable revision dictionary.
+def from_revision(revision: Union[Dict[str, Any], Revision]) -> Dict[str, Any]:
+    """Convert swh revision model object to a json serializable revision dictionary.
 
     Args:
-        revision (dict): dict with keys:
-
-            - id: identifier of the revision (sha1 in bytes)
-            - directory: identifier of the directory the revision points to
-              (sha1 in bytes)
-            - author_name, author_email: author's revision name and email
-            - committer_name, committer_email: committer's revision name and
-              email
-            - message: revision's message
-            - date, date_offset: revision's author date
-            - committer_date, committer_date_offset: revision's commit date
-            - parents: list of parents for such revision
-            - synthetic: revision's property nature
-            - type: revision's type (git, tar or dsc at the moment)
-            - metadata: if the revision is synthetic, this can reference
-              dynamic properties.
+        revision: revision model object
 
     Returns:
         dict: Revision dictionary with the same keys as inputs, except:
@@ -289,26 +274,30 @@
         Remaining keys are left as is
 
     """
-    revision = from_swh(
-        revision,
+    if isinstance(revision, Revision):
+        revision_d = revision.to_dict()
+    else:
+        revision_d = revision
+    revision_d = from_swh(
+        revision_d,
         hashess={"id", "directory", "parents", "children"},
-        bytess={"name", "fullname", "email"},
+        bytess={"name", "fullname", "email", "extra_headers"},
         convert={"metadata"},
         convert_fn=convert_revision_metadata,
         dates={"date", "committer_date"},
     )
 
-    if revision:
-        if "parents" in revision:
-            revision["merge"] = len(revision["parents"]) > 1
-        if "message" in revision:
+    if revision_d:
+        if "parents" in revision_d:
+            revision_d["merge"] = len(revision_d["parents"]) > 1
+        if "message" in revision_d:
             try:
-                revision["message"] = revision["message"].decode("utf-8")
+                revision_d["message"] = revision_d["message"].decode("utf-8")
             except UnicodeDecodeError:
-                revision["message_decoding_failed"] = True
-                revision["message"] = None
+                revision_d["message_decoding_failed"] = True
+                revision_d["message"] = None
 
-    return revision
+    return revision_d
 
 
 def from_content(content):
diff --git a/swh/web/common/service.py b/swh/web/common/service.py
--- a/swh/web/common/service.py
+++ b/swh/web/common/service.py
@@ -8,11 +8,11 @@
 import re
 
 from collections import defaultdict
-from typing import Any, Dict, List, Set, Iterable, Iterator, Optional, Tuple
+from typing import Any, Dict, List, Set, Iterable, Iterator, Optional, Union, Tuple
 
 from swh.model import hashutil
 from swh.model.identifiers import CONTENT, DIRECTORY, RELEASE, REVISION, SNAPSHOT
-from swh.model.model import OriginVisit
+from swh.model.model import OriginVisit, Revision
 from swh.storage.algos import diff, revisions_walker
 from swh.storage.algos.origin import origin_get_latest_visit_status
 from swh.storage.algos.snapshot import snapshot_get_latest
@@ -489,7 +489,7 @@
             yield None
 
 
-def lookup_revision(rev_sha1_git):
+def lookup_revision(rev_sha1_git) -> Dict[str, Any]:
     """Return information about the revision with sha1 revision_sha1_git.
 
     Args:
@@ -504,32 +504,36 @@
 
     """
     sha1_git_bin = _to_sha1_bin(rev_sha1_git)
-    revision = _first_element(storage.revision_get([sha1_git_bin]))
+    revision = storage.revision_get([sha1_git_bin])[0]
     if not revision:
-        raise NotFoundExc("Revision with sha1_git %s not found." % rev_sha1_git)
+        raise NotFoundExc(f"Revision with sha1_git {rev_sha1_git} not found.")
     return converters.from_revision(revision)
 
 
-def lookup_revision_multiple(sha1_git_list):
+def lookup_revision_multiple(sha1_git_list) -> Iterator[Optional[Dict[str, Any]]]:
     """Return information about the revisions identified with
     their sha1_git identifiers.
 
     Args:
         sha1_git_list: A list of revision sha1_git identifiers
 
-    Returns:
-        Iterator of revisions information as dict.
+    Yields:
+        revision information as dict if the revision exists, None otherwise.
 
     Raises:
         ValueError if the identifier provided is not of sha1 nature.
 
     """
     sha1_bin_list = [_to_sha1_bin(sha1_git) for sha1_git in sha1_git_list]
-    revisions = storage.revision_get(sha1_bin_list) or []
-    return (converters.from_revision(r) for r in revisions)
+    revisions = storage.revision_get(sha1_bin_list)
+    for revision in revisions:
+        if revision is not None:
+            yield converters.from_revision(revision)
+        else:
+            yield None
 
 
-def lookup_revision_message(rev_sha1_git):
+def lookup_revision_message(rev_sha1_git) -> Dict[str, bytes]:
     """Return the raw message of the revision with sha1 revision_sha1_git.
 
     Args:
@@ -544,14 +548,12 @@
 
     """
     sha1_git_bin = _to_sha1_bin(rev_sha1_git)
-
-    revision = _first_element(storage.revision_get([sha1_git_bin]))
+    revision = storage.revision_get([sha1_git_bin])[0]
     if not revision:
-        raise NotFoundExc("Revision with sha1_git %s not found." % rev_sha1_git)
-    if "message" not in revision:
-        raise NotFoundExc("No message for revision with sha1_git %s." % rev_sha1_git)
-    res = {"message": revision["message"]}
-    return res
+        raise NotFoundExc(f"Revision with sha1_git {rev_sha1_git} not found.")
+    if not revision.message:
+        raise NotFoundExc(f"No message for revision with sha1_git {rev_sha1_git}.")
+    return {"message": revision.message}
 
 
 def _lookup_revision_id_by(origin, branch_name, timestamp):
@@ -689,15 +691,16 @@
 
     rev_root_id_bin = hashutil.hash_to_bytes(rev_root_id)
 
-    rev_root = _first_element(storage.revision_get([rev_root_id_bin]))
-
+    rev_root = storage.revision_get([rev_root_id_bin])[0]
     return (
-        converters.from_revision(rev_root),
+        converters.from_revision(rev_root) if rev_root else None,
         lookup_revision_with_context(rev_root, sha1_git, limit),
     )
 
 
-def lookup_revision_with_context(sha1_git_root, sha1_git, limit=100):
+def lookup_revision_with_context(
+    sha1_git_root: Union[str, Dict[str, Any], Revision], sha1_git: str, limit: int = 100
+) -> Dict[str, Any]:
     """Return information about revision sha1_git, limited to the
     sub-graph of all transitive parents of sha1_git_root.
 
@@ -721,22 +724,24 @@
     """
     sha1_git_bin = _to_sha1_bin(sha1_git)
 
-    revision = _first_element(storage.revision_get([sha1_git_bin]))
+    revision = storage.revision_get([sha1_git_bin])[0]
     if not revision:
-        raise NotFoundExc("Revision %s not found" % sha1_git)
+        raise NotFoundExc(f"Revision {sha1_git} not found")
 
     if isinstance(sha1_git_root, str):
         sha1_git_root_bin = _to_sha1_bin(sha1_git_root)
 
-        revision_root = _first_element(storage.revision_get([sha1_git_root_bin]))
+        revision_root = storage.revision_get([sha1_git_root_bin])[0]
         if not revision_root:
-            raise NotFoundExc("Revision root %s not found" % sha1_git_root)
+            raise NotFoundExc(f"Revision root {sha1_git_root} not found")
+    elif isinstance(sha1_git_root, Revision):
+        sha1_git_root_bin = sha1_git_root.id
     else:
         sha1_git_root_bin = sha1_git_root["id"]
 
     revision_log = storage.revision_log([sha1_git_root_bin], limit)
 
-    parents = {}
+    parents: Dict[str, List[str]] = {}
     children = defaultdict(list)
 
     for rev in revision_log:
@@ -746,14 +751,12 @@
             parents[rev_id].append(parent_id)
             children[parent_id].append(rev_id)
 
-    if revision["id"] not in parents:
-        raise NotFoundExc(
-            "Revision %s is not an ancestor of %s" % (sha1_git, sha1_git_root)
-        )
+    if revision.id not in parents:
+        raise NotFoundExc(f"Revision {sha1_git} is not an ancestor of {sha1_git_root}")
 
-    revision["children"] = children[revision["id"]]
-
-    return converters.from_revision(revision)
+    revision_d = revision.to_dict()
+    revision_d["children"] = children[revision.id]
+    return converters.from_revision(revision_d)
 
 
 def lookup_directory_with_revision(sha1_git, dir_path=None, with_data=False):
@@ -779,10 +782,10 @@
 
     """
     sha1_git_bin = _to_sha1_bin(sha1_git)
-    revision = _first_element(storage.revision_get([sha1_git_bin]))
+    revision = storage.revision_get([sha1_git_bin])[0]
     if not revision:
-        raise NotFoundExc("Revision %s not found" % sha1_git)
-    dir_sha1_git_bin = revision["directory"]
+        raise NotFoundExc(f"Revision {sha1_git} not found")
+    dir_sha1_git_bin = revision.directory
     if dir_path:
         paths = dir_path.strip(os.path.sep).split(os.path.sep)
         entity = storage.directory_entry_get_by_path(
@@ -819,12 +822,12 @@
             "content": converters.from_content(content_d),
         }
     elif entity["type"] == "rev":  # revision
-        revision = next(storage.revision_get([entity["target"]]))
+        revision = storage.revision_get([entity["target"]])[0]
         return {
             "type": "rev",
             "path": "." if not dir_path else dir_path,
             "revision": sha1_git,
-            "content": converters.from_revision(revision),
+            "content": converters.from_revision(revision) if revision else None,
         }
     else:
         raise NotImplementedError("Entity of type %s not implemented." % entity["type"])
diff --git a/swh/web/tests/common/test_converters.py b/swh/web/tests/common/test_converters.py
--- a/swh/web/tests/common/test_converters.py
+++ b/swh/web/tests/common/test_converters.py
@@ -10,6 +10,8 @@
     ObjectType,
     Person,
     Release,
+    Revision,
+    RevisionType,
     TimestampWithTimezone,
     Timestamp,
 )
@@ -253,7 +255,108 @@
     assert actual_release == expected_release
 
 
+def test_from_revision_model_object():
+    ts = int(
+        datetime.datetime(
+            2000, 1, 17, 11, 23, 54, tzinfo=datetime.timezone.utc
+        ).timestamp()
+    )
+    revision_input = Revision(
+        id=hashutil.hash_to_bytes("18d8be353ed3480476f032475e7c233eff7371d5"),
+        directory=hashutil.hash_to_bytes("7834ef7e7c357ce2af928115c6c6a42b7e2a44e6"),
+        author=Person(
+            name=b"Software Heritage",
+            fullname=b"robot robot@softwareheritage.org",
+            email=b"robot@softwareheritage.org",
+        ),
+        committer=Person(
+            name=b"Software Heritage",
+            fullname=b"robot robot@softwareheritage.org",
+            email=b"robot@softwareheritage.org",
+        ),
+        message=b"synthetic revision message",
+        date=TimestampWithTimezone(
+            timestamp=Timestamp(seconds=ts, microseconds=0),
+            offset=0,
+            negative_utc=False,
+        ),
+        committer_date=TimestampWithTimezone(
+            timestamp=Timestamp(seconds=ts, microseconds=0),
+            offset=0,
+            negative_utc=False,
+        ),
+        synthetic=True,
+        type=RevisionType.TAR,
+        parents=tuple(
+            [
+                hashutil.hash_to_bytes("29d8be353ed3480476f032475e7c244eff7371d5"),
+                hashutil.hash_to_bytes("30d8be353ed3480476f032475e7c244eff7371d5"),
+            ]
+        ),
+        extra_headers=((b"gpgsig", b"some-signature"),),
+        metadata={
+            "original_artifact": [
+                {
+                    "archive_type": "tar",
+                    "name": "webbase-5.7.0.tar.gz",
+                    "sha1": "147f73f369733d088b7a6fa9c4e0273dcd3c7ccd",
+                    "sha1_git": "6a15ea8b881069adedf11feceec35588f2cfe8f1",
+                    "sha256": "401d0df797110bea805d358b85bcc1ced29549d3d73f"
+                    "309d36484e7edf7bb912",
+                }
+            ],
+        },
+    )
+
+    expected_revision = {
+        "id": "18d8be353ed3480476f032475e7c233eff7371d5",
+        "directory": "7834ef7e7c357ce2af928115c6c6a42b7e2a44e6",
+        "author": {
+            "name": "Software Heritage",
+            "fullname": "robot robot@softwareheritage.org",
+            "email": "robot@softwareheritage.org",
+        },
+        "committer": {
+            "name": "Software Heritage",
+            "fullname": "robot robot@softwareheritage.org",
+            "email": "robot@softwareheritage.org",
+        },
+        "message": "synthetic revision message",
+        "date": "2000-01-17T11:23:54+00:00",
+        "committer_date": "2000-01-17T11:23:54+00:00",
+        "parents": tuple(
+            [
+                "29d8be353ed3480476f032475e7c244eff7371d5",
+                "30d8be353ed3480476f032475e7c244eff7371d5",
+            ]
+        ),
+        "type": "tar",
+        "synthetic": True,
+        "extra_headers": (("gpgsig", "some-signature"),),
+        "metadata": {
+            "original_artifact": [
+                {
+                    "archive_type": "tar",
+                    "name": "webbase-5.7.0.tar.gz",
+                    "sha1": "147f73f369733d088b7a6fa9c4e0273dcd3c7ccd",
+                    "sha1_git": "6a15ea8b881069adedf11feceec35588f2cfe8f1",
+                    "sha256": "401d0df797110bea805d358b85bcc1ced29549d3d73f"
+                    "309d36484e7edf7bb912",
+                }
+            ],
+        },
+        "merge": True,
+    }
+
+    actual_revision = converters.from_revision(revision_input)
+
+    assert actual_revision == expected_revision
+
+
 def test_from_revision():
+    ts = datetime.datetime(
+        2000, 1, 17, 11, 23, 54, tzinfo=datetime.timezone.utc
+    ).timestamp()
     revision_input = {
         "id": hashutil.hash_to_bytes("18d8be353ed3480476f032475e7c233eff7371d5"),
         "directory": hashutil.hash_to_bytes("7834ef7e7c357ce2af928115c6c6a42b7e2a44e6"),
@@ -268,20 +371,8 @@
             "email": b"robot@softwareheritage.org",
         },
         "message": b"synthetic revision message",
-        "date": {
-            "timestamp": datetime.datetime(
-                2000, 1, 17, 11, 23, 54, tzinfo=datetime.timezone.utc
-            ).timestamp(),
-            "offset": 0,
-            "negative_utc": False,
-        },
-        "committer_date": {
-            "timestamp": datetime.datetime(
-                2000, 1, 17, 11, 23, 54, tzinfo=datetime.timezone.utc
-            ).timestamp(),
-            "offset": 0,
-            "negative_utc": False,
-        },
+        "date": {"timestamp": ts, "offset": 0, "negative_utc": False,},
+        "committer_date": {"timestamp": ts, "offset": 0, "negative_utc": False,},
         "synthetic": True,
         "type": "tar",
         "parents": [
diff --git a/swh/web/tests/conftest.py b/swh/web/tests/conftest.py
--- a/swh/web/tests/conftest.py
+++ b/swh/web/tests/conftest.py
@@ -210,10 +210,10 @@
         rel_data = self.storage.release_get([rel_id_bytes])[0]
         return converters.from_release(rel_data) if rel_data else None
 
-    def revision_get(self, rev_id):
+    def revision_get(self, rev_id: str) -> Optional[Dict[str, Any]]:
         rev_id_bytes = hash_to_bytes(rev_id)
-        rev_data = next(self.storage.revision_get([rev_id_bytes]))
-        return converters.from_revision(rev_data)
+        rev_data = self.storage.revision_get([rev_id_bytes])[0]
+        return converters.from_revision(rev_data) if rev_data else None
 
     def revision_log(self, rev_id, limit=None):
         rev_id_bytes = hash_to_bytes(rev_id)
diff --git a/swh/web/tests/data.py b/swh/web/tests/data.py
--- a/swh/web/tests/data.py
+++ b/swh/web/tests/data.py
@@ -236,7 +236,9 @@
             revisions.add(rev_id)
 
         for rev in storage.revision_get(revisions):
-            dir_id = rev["directory"]
+            if rev is None:
+                continue
+            dir_id = rev.directory
             directories.add(hash_to_hex(dir_id))
             for entry in dir_iterator(storage, dir_id):
                 if entry["type"] == "file":
diff --git a/swh/web/tests/strategies.py b/swh/web/tests/strategies.py
--- a/swh/web/tests/strategies.py
+++ b/swh/web/tests/strategies.py
@@ -368,7 +368,7 @@
     into the test archive.
     """
     return sha1().filter(
-        lambda s: next(get_tests_data()["storage"].revision_get([hash_to_bytes(s)]))
+        lambda s: get_tests_data()["storage"].revision_get([hash_to_bytes(s)])[0]
         is None
     )