Caligula - Quadrans money reform (MA2212)
Augustus - Moneyer issue Salvius Otho with Caligula counter mark (JUN2213)

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Caligula (37-41 AD). AE As (29 mm, 9,24 g), Roma (Rome), 37-38 AD. Fine
Obv. C CAESAR AVG GERMANICVS PON M TR POT, bare head of Caligula left.
Rev. VESTA / S - C, Vesta, veiled and draped, seated left on ornamental throne, holding patera and long transverse sceptre. fine