Ancients
SARONIC ISLANDS. Aegina. Ca. 480-457 BC. AR diobol (2.09 gm). Sea turtle with thin collar and row of dots down shell, seen from above / Five-part "Union Jack" incuse. Cf. HGC 6 446 (triobol). Extremely rare or unique, seemingly unrecorded in the major sources! NGC VF 4/5 - 2/5. The weight of 2.09 grams leaves little doubt it is intended as a diobol in the Aeginatic standard; however, while triobols and obols are comparatively well-attested, no diobols are listed in any of the major attribution books or auction catalogs.
Estimate: 350-500 USD