103-111 AD., Trajan, Rome mint, Æ As, cf. RIC 543.

Trajan, Rome mint, 103-111 AD.,
Æ As (25-27 mm / 10.70 g),
Obv.: IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P , laureate head of Trajan wearing aegis right.
Rev.: S P Q R OPTIMO PRINCIPI / S C , Trajan in military dress on horseback r., holding rein with l. hand and brandishing spear with r. hand, riding down fallen Dacian on knees looking back at emperor.
RIC cf. 543 ; Coh. 509 var. ; BMC 942 var. (C. Clay: unillustrated, is also an As with enemy before (not under) horse and aegis on portrait)
unpublished variant with aegis ?