Watch List notes:

ISLANDS OFF ATTICA, Aegina. Circa 550-530/25 BC. Stater (Silver, 20.0 mm, 12.61 g). "Proto-tortoise" with thin collar and shell divided into thirteen segments. Rev. Small, deep, "Union-Jack"pattern incuse square. Arnold, Beer, Waggoner, Selinus 123-124 (same obverse die). Holloway, Archaic, group C, dies 4/3 and pl. VIII, 1. Milbank 1, 12. Pozzi 1631-2. Robinson, Pseudoaeginetica, 3 (same obverse die, as Kydonia in Krete). SNG Lockett 2635 (same obverse die). Very rare. Bold and clear. Minor marks, otherwise, good very fine.
From a Swiss collection, ex Hirsch 148, 27 November 1985, 67.