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.

Photo of a coin sold the 10/01/2017 by Classical Numismatic Group, Triton XX, lot 918, link to the sale: https://www.acsearch.info/search.html?id=3594997, link to their website: https://www.cngcoins.com/. This coin shares the same obverse die as the AYC #12.

Variant with shoulder without cross, large wreath and small Chi-Rho 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.