Euboia, Eretria.
Ca. 510-490 BC. AR stater, 8.25 g. Cow standing right, head left, scratching head with its hind foot; E below / octopus in incuse square. BCD Euboia 313 (same obverse die); CNG MailBidSale 67, lot 546 (same reverse die). Some corrosion on obv. RR. Very fine.