Bactrian Kingdom, Eucratides I, 171-135 BC, Tetradrachm ca. 170-145 BC, very rare

Bactrian Kingdom. Eucratides I, 171-135 BC. Tetradrachm ca. 170-145 BC. Silver 15.16 g.; 34 mm.
Obverse: Diademed heroic bust of Eucratides left, seen from behind, wearing crested Bactrian helmet adorned with bull's horn and ear, brandishing spear in right hand; bead and reel border //
Reverse: Dioscuri on horses prancing right, both with couched spear in right hand, palm in left over shoulder; ΦΛ monogram in lower right field. Reverse capiton: BAΣIΛEΩΣ MEΓAΛOY // EYKPATIΔOY

HGC: 12-132.

This type with heroic bust left is the rarest of Eucratides tetradrachm types! Well-centered flan with high relief. Corrosion. Extremely fine EF 40-45