Coins of the Bosporan Kingdom
This coin is called a Sestertius - of course that doesn't necessarily have any connection to what the people who minted this coin may have called it.
Kings of Bosporus, Sauromates I AD 93-124 AE
Obv: BACIΛЄVC CAVPOMATOY
Diademed and draped bust right.
Rev: Large MH (mark of value) within wreath.
I didn't realize that this was an electrum coin when I purchased it on EBay years ago, I assumed it was a silver stater. While there is a slight gold color on the surface it is clearly not very pure gold. This 7.2g, 20.3mm stater is the only electrum coin I have from the Kingdom of Bosporus
KINGS of BOSPORUS, Rhescuporis IV, with Philip I circa AD 242/3-276/7, Billion Stater (20.3mm, 7.2 g).
Date: Bosporan Era 541 (244/245)
Obv: BΛCIΛEωC ΠHCKOΠoRIK Diademed and draped bust of Rheskouporis IV right
Rev: Laureate and draped bust of Philip I right; club before, AMΦ (date) below.
Ref: MacDonald 602; Anokhin 691; Stanislavskii 640