Æ 27mm. [IMP CM] AV ANTONI[NVS AVG] His laureate bust right.  R. [COL AVG] PIA METR[O SID] Three-legged table bearing two agonistic crowns. Two small indistinct countermarks.  BMC p.191, 283.  Corroded both sides, otherwise Fine

The information with this coin from the Albert Reeves collection says that it was bought for £6 on 27 Sep. 1989 from Ian Johnson, graded F/GF.