Watch List notes:

ASIA MINOR, Lycia (?). Uncertain mint. Late 6th - early 5th century BC. Obol (Silver, 8 mm, 0.55 g). Calf of bull's head to left. Rev. Incuse square with a central pellet enclosed in a linear lozenge forming an incuse triangle in corner of the square. Apparently unpublished except for auction appearances, see: Savoca 25, Silver, 2018, 110; CNG e369, 2016, 140; and CNG e170, 2007, 99. Pleasing and bold with a dark patina. Nearly extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions.

Small coins - obols primarily - with a similar reverse but with a ram's head on the obverse have been attributed to Lycia by K. Konuk; others have suggested that they are Karian or Ionian (see NAC, 82, 2015, 172).