IMP CM CL TACITVS AVG	RC	SALVS AVG	Salus	standing left by altar	sceptre, and feeding serpent rising from altar	XXI delta			Rome	Estiot 0730, La Venera 1857	C		

Quality silvered antoninianus of Tacitus (275-276 AD) 

Tacitus AE Antoninianus. Rome mint. 
IMP C M CL TACITVS AVG, radiate, cuirassed bust right
SALVS AVG, Salus standing left feeding serpent rising from altar
Mintmark: XXI Delta in ex.
21mm, 2.9 grams. 

RIC 93, Cohen 123; Estiot 0730, La Venera 1857. 
Price: US$ 50.00 (2007-04-21) 

Courtesy ancientcoins canada