GIC 554
5.5–6.5 x 2–2.5 mm 
Has been attributed to Cos, due to association with the GIC 355 Crab on a coin in Emerkingen. The inscription could then only be for a magistrate of the name of Nicomedes. One is known at Cos earlier, but not at this date. A more natural interpretation could be for Nicomedia? 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1656 Show 1656 64 1
RPC I, 1656 Show 1656 99 1