Constantine II. 307-324 AD. Lyons.

Obv: CONSTANTI-N(VS IVN AVG), laurel and rosette-diademed, 
draped, cuirassed bust right
Rev: GLOR-IA EXERC-ITVS, two soldiers holding spears and 
shields with one standard between them, chi-rho on banner.

Mintmark: PLG or SLG

Ref: RIC VIII Lyons 5. Rare.

Found in England by English metal detectorist Andy Muller, 
submitted in Feb. 2010.