Watch List notes:

Postumus Ӕ Double Sestertius. Treveri, AD 261. IMP C M CASS LAT POSTVM[VS P F AVG], radiate, draped and cuirassed bust to right / LAET[ITIA], galley with mast rowing to left; AVG in exergue. RIC V.2 143 (Lugdunum); Elmer 243; J. Mairat, The coinage of the Gallic Empire, Wolfson College, Trinity, 2014 (unpublished PhD Thesis), 124.15.46g, 31mm, 3h.

Good Fine.

From a private UK collection;
Ex Roma Numismatics Ltd., E-Sale 26, 30 April 2016, lot 949.