Watch List notes:

Valentinian II (AD 375-392) AR Siliqua, Siscia, 'Festal Issue', AD 377-378, 0.99g. Diademed, draped and cuirassed bust right. Rev. Christogram within wreath, SISCP in exergue. (See CNG 106, 851; RIC -). Extremely Rare and apparently unpublished. Extremely Fine and lustrous. Likely clipped, explaining the weight deficiency.