Nummus - Galerius GENIO AVGG ET CAESARVM NN, Cyzicus

The GENIO AVGG ET CAESARVM NN reverse type was introduced as part of the Diocletianic monetary reform of 294 AD, which overhauled the coinage system and introduced the nummus as a large, silvered bronze denomination. Cyzicus was one of the new or reorganized mints activated under that reform, and its early output from this period shows the characteristic officina marks that allow scholars to reconstruct the mint's staffing and production sequence in unusual detail.

RIC VI 9b distinguishes this piece by officina. Cyzicus used Greek letter officina marks during this period — a minor but useful diagnostic for attributing unmarked or worn examples.