This is an Ur III cylinder seal, according to a note of Prof. Lambert, the inscription reads:"Ur-gigir, scribe, son of Mezu"(ex Collector Antiquities)

This is a typical Harappa seal, 2300-2000 B.C. Authenticity was confirmed by Dr. Winkelmann, see links.
(ex Barakat Gallery)

This Ur III seal depicts a typical presentation scene and name and title of an official:

Ur-d-Ba-ba6 = Ur-BabA
Aga3-ush2 lugal-x-x = royal bailiff ...
Dumu dNanna-ku3-zu = son of Nanna-kuzu.

(ex Collector Antiquities, now in the collection of S. R.)

An Ur III cylinder seal with inscription (ex Collector Antiquities)