Probus, AE antoninianus, Ticinum, AD 279.

IMP C PROBVS AVG CONS III, radiate bust left, wearing 
imperial mantle decorated with a wreath, and holding
eagle-tipped sceptre.
SALVS AVG, Salus seated left by altar, feeding serpent rising 
from altar.

Mintmark AXXI.
RIC V-2 Ticinum 565 var (bust type).
Rare.

With permission of numislanz.de, Auktion 102, lot 967
May 2001