Crispus as Caesar (317-326). PB 'Solidus', Treveri mint. Obv. FL IVL CRISPVS NOB CAES. Laureate head right. Rev. PRINCIPI IVVENTVTIS. Prince standing right, holding transverse spear and globe; in exergue, PTR. Cf. RIC 186 (AV Solidus). PB. g. 2.94 mm. 19.50 RRR. Extremely rare and interesting. Grey-green patina. About EF. An enigmatic coin, probably from solidus dies: a trial strike?.