Watch List notes:

Unpublished Double-Reverse As of Antoninus Pius. 40-as; Unpublished Double-Reverse As of Antoninus Pius; 138-161 AD, Rome, 161 AD, As, 9.73g. Cf. BM-2115, with the standard obverse type of portrait and titles of the emperor. Obv: TR P XXIIII - COS IIII around, S - C across field, Aeternitas standing r. holding short caduceus and phoenix on globe. Rx: The same type and legend, but from a different die. It seems that the second-century Roman asses that repeated the same obverse type or the same reverse type on both sides of the coin may have been produced for use as New Year's gifts, since we know that asses were a favorite denomination for such gifts; see Numismatic Chronicle 172, 2012, pp. 359-361. Very rare: Strack knew only three double-reverse asses of Antoninus Pius, all with a different type and from different years than ours, plus six double-obverse As types of the same emperor, four of them unique and the fifth type recorded in two specimens (Strack, pp. 325-7).. Fine