Watch List notes:

Maxentius, as Princeps and Caesar, 306-307. Aureus (Gold, 18 mm, 5.49 g, 12 h), Rome, early - March 307. MAXENTIVS - PRINC INVICT Laureate head of Maxentius to right. Rev. CONSERVAT - O - R VRBIS SVAE / P R Roma, draped and helmeted, seated on round shield to left, holding Victory on globe in her extended right hand and long scepter in her left. Depeyrot 14/3. Drost 15b/2 (this coin). Drost/Gautier 113 (this coin). RIC 143/144 . Extremely rare. Well-struck and clear. Typical slightly matte surfaces, otherwise, good extremely fine.
From a Swiss collection, and once with Münzen und Medaillen in Basel in the late 1950s.