Watch List notes:

BITHYNIA. Kalchedon. late 3rd-2nd century BC. (Bronze, 22 mm, 5.38 g, 6 h). Laureate head of Apollo to left; c/m of a thunderbolt and Π within a circular indent. Rev. KAΛXA/ΔΟNIΩΝ Tripod. SNG BM Black Sea 137-8. Dark brown patina. Green encrustations, otherwise, very fine.