An important die match!
AR Denarius (19mm, 3.34g, 5h). Rome mint, struck Sept 18 - Dec 31, 81 (Third Issue, RIC's "Group 4"), hhioo.
IMP CAES DOMITIANVS AVG P M, head laureate right; TR P COS VII DES VIII P P, draped seat, winged thunderbolt above, pulvinarium of Jupiter.
RIC 70 (C), BMC 15, RSC 575.
This coin is a reverse die match for RIC 68 in this coll., proving, in my opinion, that the coins reading PONT were discontinued early in the issue in favor of P M.