I just finished this. CONSTANTINOPOLIS, 337-340 AD. Æ 3 of Siscia. CONSTANTINOPOLIS, Helmeted bust of Constantinopolis left, holding sceptre Victory standing on prow, holding sceptre and resting hand on shield. RIC VIII Siscia 224; cf Sear 3890.
You left off the "S" on the end. The only mints that dropped the "S" were Heraclea, Constantinople, Nicomedia and Cyzicus
Bronze coin (AE 3/4) minted at Lyons during the reign of Constantine I, The Great in 336 A.D. Commemorative Issue. CONSTANT-INOPOLIS. Obv. Helmeted bust of Constantinopolis l., wearing imperial mantle & holding sceptre. Rev. No legend Victory standing l., r. foot on prow holding sceptre & leaning on shield. RCS #3890. DVM #1. RICVII #279 pg.141.
Bronze coin (AE 3/4) minted at Constantinople during the reign of Constantine I, The Great between 330 - 346 A.D. Commemorative Issue. CONSTAN-TINOPOLIS. Obv. Helmeted bust of Constantinopolis l., wearing imperial mantle & holding sceptre. Rev. No legend Victory standing l., r. foot on prow holding sceptre & leaning on shield. RCS #3890. RICVIII #32. DVM #1.
Here's my most successful cleaned C-polis. And here are two rather attractive ones. The details on the Lyons one is really top notch. Alexandria, on the other hand, is a bit more crude, with some features (ie the ships prow) being reduced to but a shadow of a hint, but has a character all its own.