AR Denarius (18mm, 2.80g, 5h). Rome mint, struck Sept 18 - Dec 31, 81 (Third Issue, RIC's "Group 4"), egjnd.
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 corn ears, pulvinarium of the goddess Isis.
RIC 64 (R), BMC--, RSC 573.
There is an obverse die match between this particular coin and the RIC 67 specimen in this collection. I have no idea the significance of this. It isn't mentioned in RIC.