Septimius Severus, AR denarius, 20mm, 3.40 gr. 

SEVERVS PIVS AVG, laureate head right.
COS III P P, the arch of Septimius Severus on the Forum 
Romanum: triumphal arch with three entrances, four high 
columns; surmounted by a chariot drawn by six horses,
with a statue to left and right. 

RIC 259; Sear 6271; BMC 320.
Very rare.

courtesy of Dr. Hubert Lanz, November 2000.