Watch List notes:

Greek Asia. Troas, Antandros. AR Diobol, 5th century BC. Head of Artemis Astyrene right. / Head of lion right; before, ANTAN; all within incuse square. Unlisted in the standard references (cf. SNG Von Aulock 7582, later issue without incuse). AR. 1.01 g. 10.00 mm. RRRR. Extremely rare and superb. Lovely blackish toning. About EF/EF.

Apparently the third specimen known with the reverse in incuse (cf. CNG 94, lot 469 and Roma Numismatics 55, lot 281).