Constantine I (307-337). AR Half Siliqua, Treveri mint, 308-313 AD. D/ IMP CONSTANTINVS AVG. Laureate and cuirassed bust right. R/ VIRTVS MILITVM. Four-turreted gateway, with no doors; in exergue, PTR. RIC VI, 828 (R3). AR. g. 1.58 mm. 15.50 RRR. Very rare and in exceptional condition for issue. Enchanting iridescent tone, with underlying luster. Virtually as struck. About FDC/FDC.