Greetings.. That is the first time that I encounter unusual reverses on coins of Emperor Constantine such like these two attached. I meant by unusual that they are new to me despite the fact that I have watched hundreds of coins representing that great Roman Emperor. I do always appreciate your identifying comments and valuable remarks. Thanks.. Charles
Neither are unusual. The first is: Alexandria RIC VIII 32 Divus Constantine I AE Follis. 347-8 AD. DV CONSTANTINVS PT AVGG, veiled bust right / VN-MR, Emperor veiled standing right, SMAL[officina] in ex.
I'm not certain about the second, but I think it may be: Trier RIC VII 435, P Constantine AE3. 323-324 AD. CONSTANTINVS AVG, laureate head right / SARMATIA-DEVICTA, Victory advancing right, holding trophy on right arm, branch in left hand, spurning captive seated on ground right, head turned back. Mintmark PTR crescent.