Constantine I, Maximinus II and Licinius I. Probably an AE offstrike of an unknown AV medallion. 26 mm, 3.06 g. Siscia AD 312-313. 

[CON]STANTIN[VS AVG M]AXIMINVS AVG LICINIVS AVG, facing draped busts of Constantine I, Licinius I and Maximinus II, arranged in a trefoil pattern.
AE[QVI]TAS AVGVSTORVM NOS[TR], Aequitas standing left, holding scales and cornucopiae. 

Mintmark SIS.

Not in RIC, Cohen, Gnecchi, Toynbee, Froehner, Kenner, Dumbarton Oaks, Fagerlie etc. Probably unpublished and unique. Leu 30, 2604.

With permission of Leu Numismatik Web Auction 30, Lot 2604, July 2024.