mgcoins database 
Rome AD 275-276 billon antoninianus 3.8 g 2.06 cm 2.06 cm 5h
obverse: hd Tacitus r radiate IMP C M CL TACITVS AVG
reverse: Salus stg l resting on sceptre, feeding snake arising from altar SALVS AVG, XXIΔ in ex
Sear RCV III 11807
Holleman Munten list 146 (Nov 2004) 229
Marcus Claudius Tacitus (275-276)
XXI 20 parts of copper 1 part of silver, Δ =4 officina mark
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