Here was a nice surprise from a group of otherwise unassuming coins.
RIC only lists consular busts for this issue for Constantine I. It should come before RIC 423. This type is listed in “Die Römische Münzserie Beata Tranquillitas in der Prägestätte Trier 321-323” (RMBT) as # 136.
Constantine I
A.D. 321- 323
19mm 3.3g
CONSTAN-TINVS AVG; helmeted and cuirassed bust right.
BEATA TRAN-QVILLITAS; globe set on altar inscribed VO / TIS / XX; above, three stars
In ex. STR crescent
RIC VII Trier --; RMBT 136