Severus Alexander (222-235).     AR Denarius, 222-228.   Obv.    IMP C M AVR SEV ALEXAND AVG. Laureate, draped and cuirassed bust right.        Rev.   PAX AVG. Pax running left, holding olive branch and sceptre.     RIC IV  168.     3.68 g.   19.60 mm.          Good VF.