Doug Smith has an interesting page detailing challenges in grading ancient coins, using these COL-NEMs as examples.

 

 

Augustus & Agrippa

struck c. 10 BCE - CE 10, Nemausus

AE dupondius

Obv:  IMP/DIVI F, back-to-back heads of Agrippa, in combined rostral crown & laurel wreath, and Augustus, laureate

Rev:   COL - NEM; palm tree, top bent top right with a wreath above; crocodile chained to palm tree

Ref:   RIC 158; AMC 425; Cohen 10; RPC 524

From the collection of a Man of the Cloth, now giving up the pursuit; acquired in the 1990s