AE Tessera or half unit, Argos, Argolis,  4th-2nd c. BC. 10mm, 0.99 g.

FI retrograde.
A within shallow incuse square.

BCD Peloponnesos 1121.3. 

Near VF, brown patina. Very rare.

Origin uncertain, believed to be from a 2nd century Peloponnesian 
hoard. Mint city also uncertain. 

CNG 147, Lot 32. Estimate $100. Sold for $60.
With permission of cngcoins.com