★ Extremely rare naval type ★

BITHYNIA, Calchedon: Severus Alexander (222-235). AE19. 4.08g, 19mm.
Obv: AΛEΞANΔPOC AVΓOVCTOC; Laureate head right.
Rev: KAΛXAΔONIΩN; Galley with four rowers, r., aplustre on stern.
RPC VI online 3521(temp) (3 specimens cited)
From the JB (Edmonton) collection.
Estimate: 200

Perhaps the fourth known example; the type is rare for any emperor, and the city is rare for Severus Alexander.