Watch List notes:

The Roman Empire

Postumus, 259 – 268. Double sestertius, mint II 261-263, Æ 21.26 g. Radiate, draped and cuirassed bust r. Rev. Galley with four oarsmen sailing l. over waves. C 179. Bastien 143, 87. RIC 143.
Brown tone and about extremely fine
Ex Ratto sale 3, 1932, Schwind, 717.