1. Trajan's Column
This reverse appears on the as, dupondius, sestertius, denarius and aureus. As it is still standing in reasonably nice condition today, this reverse type is always a favorite among collectors.
From the Matthew Sersch Collection (Ex)
obv : IMP CAES NERVAE TRAIANO AVG GER DAC PM TRP COS VI PP
rev: SPQR OPTIMO PRINCIPI SC
Bust right, draped and cuirassed