Trajan AE dupondius. ca 104-107 AD. 

IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P,
radiate head right.
SPQR OPTIMO PRINCIPI, S C in exergue, arched, single-span 
bridge with six posts, tower at each end, boat sailing left 
in river below. RIC 570; Sear -; Cohen 544. 

Courtesy of TimeLine Auctions (www.timelineauctions.com), Aug, 2012