Anepigraph
Bust of Galla Placidia to the right, draped with latin cross on right shoulder, wearing a diadem of pearls, a double necklace of pearls and long earrings.
Chi-Rho inside laurel wreath.
Marks
One coin sold by Numismatica Genevensis SA, link to the sale: https://www.acsearch.info/search.html?id=2233032. Ex Collection Biaggi 2335, coin from the sale Monnaies et Médailles SA XV, 1955, lot 897. This coin shares the same obverse die as the AYC #12 var.
I noticed that the bust of this coin is without a cross on the right shoulder. I therefore classify this copy as variant n ° 1. The wreath on the reverse is large in size, the space with the beading is small. Variants of AYC #12 are with a Chi-Rho or latin cross on the shoulder as well as a different wreath and Chi-Rho size on the reverse.
Apart from a coin whose authenticity remains to be confirmed, all the Tremissi that I have seen show a bust with a double pearl necklace.