Constantine AE3. 322-323 AD. 

Obv: CONSTANTINVS AVG, Helmeted, cuirassed bust right 
Rev: BEATA TRAN-QVILLITAS, Altar inscribed VO TIS XX, surmounted 
by globe, three stars above.

Mintmark dot STR dot.

RIC VII Trier 368.
Rated C3.

From Dane's collection. Jan 2013. 
Found in England. PAS registered no: HAMP-556671.