Kydonia, Crete, AR triobol, 12 mm, 2.78 g. ca. 450-330 BC.

Tortoise with T-pattern shell; K in right field.
Incuse square with skew pattern of five sections. 

SNG Delepierre 1528 (K not visible).

With permission of cngcoins.com, auction 108, Lot 154, May 2018.