Constantine I AE3. Trier.

Obv: CONSTAN-TINVS AVG, laureate bust right, wearing trabea, 
holding eagle-tipped sceptre 
Rev: BEATA TRAN-QVILLITAS, altar inscribed VO-TIS XX, three 
stars above. 
Mintmark: PTR dot.

RIC VII Trier 342 
With permission of www.slaveycoins.com, March 2012.