AR Denarius (17mm, 3.20g, 5h). Rome mint, struck c. Sept 16 - Dec 31, 81 (Second Issue, RIC's "Group 4"), fgjid.
IMP CAES DOMITIANVS AVG P M, head laureate right; TR P COS VII DES VIII P P, draped seat below an arched canopy decorated with three crescents and dots, pulvinarium of the goddess Isis.
RIC 67 (R), BMC 10, RSC 573 (no distinction is drawn between crescents and corn ears in RSC).
There is an obverse die match between this particular coin and the RIC 64 specimen in this collection. I have no idea the significance of this. It isn't mentioned in RIC.