ANCIENT GREECE. MYSIA, PERGAMON.
Silver Cistophoric Tetradrachm, circa 166-160 BC.
Obv: Serpent emerging from cista mystica; all within ivy wreath. Rev: two serpents entwined around bow and bowcase; monogram to left, AΣ inverted in linear frame to right.

Good Very Fine; an interesting coin with square device in field inverted, potentially a die-engraver's error of an otherwise still Extremely Rare and early type with only two examples in CoinArchives.

Reference: Kleiner-Noe-Series 2 var. (square device inverted); SNG BN-; SNG von Aulock-; cf. CNG E-440, 120; cf. Roma E-19, 268.
Rarity: Extremely Rare; seemingly unpublished and possibly unique with square device inverted.
Die Axis: 1h.
Diameter: 29 mm.
Weight: 12.10 g.