Caracalla AE29 of Augusta Trajana, Thrace. AD 198-217. 15.16 g. 

AYT M AYRH ANTWNINOC, laureate, cuirassed bust right.
AYGOYCTHC TRAIANHC, coiled serpent with neck vertical, radiate head right and fish-like tail.

Varbanov 1196; Moushmov 844; Schönert-Geiss 332 var (ditto).

With permission of Leu Numismatik auction 15, lot 1074, Feb 2021.