Constantine I AE3. 

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

RIC VII Trier 342 var. Altar legend break var - listed
only with VO-TIS, rated c2

Contributed by Dane for George Clegg (biggyg2), August, 2006.