Constantine the Great AE3. 322-323 AD. 

Obv: CONSTANTIVS AVG, helmeted, cuirassed bust right 
Rev: BEATA TRANQVILLITAS, globe set on altar inscribed VOT/IS/XX; three stars above.

Mintmark STR in ex.  

RIC VII Trier 303.

Contributed by Martin Griffiths, June, 2003.