Watch List notes:

KINGS OF SOPHENE. Mithradates I, 2nd half of 2nd century BC. Tetrachalkon (Bronze, 20 mm, 7.64 g, 12 h), countermarked by Mithradates II (c. 89-85 BC), Arkathiokerta(?). Diademed head of Mithradates I to left, wearing bashlyk; in the field to left, countermark of the Aramaic letter p (Kovacs 28); in field to right, almost effaced countermark ΜΙΘ in an oval indent (Kovacs 22). Rev. ΒΑΣΙΛΕΩΣ MIΘPAΔATOY Zeus standing left, holding eagle and scepter. ACV -. CAA -. Kovacs 24 (these dies). Unpublished prior to 2016. Well centered and with a dark brown patina: the best example known. Considerable pitting, otherwise, good very fine.
From the collection of Yerets' Kariatin, Switzerland.

For another coin of Mithradates I of this type, with a countermark of Mithradates II, see CNG eSale 416, 265.