Watch List notes:

THRACE, Mesambria. 4th century BC. AR Diobol (11mm, 1.24 g). Helmet facing / Ethnic within spokes of wheel; tiny O below M in ethnic; radiating lines around. Karayotov I 37–8 corr. (O on rev. not noted); Topalov, Messambria 9; SNG BM Black Sea 268–71 var. (no O below M). EF, toned. Well centered. Rare with O on reverse.