Faustina II under Antoninus Pius. Tetradrachm

Faustina II under Antoninus Pius; Billon tetradrachm, Egypt, Alexandria, Year 17 = 153/4 AD, 11.53g. Dattari/Savio pl. 171, 3263; Emmett-1959/17 (R3); not in Cologne or Oxford. Obv: ΦAVCTIN[A] - CEBACTH starting at 1:00, Draped bust r. Rx: Draped bust of Serapis r., wearing kalathos, date LI - Z across field. aEF.Some wear and porous surfaces but images of both Faustina and Serapis are clear. Light chalky top coat on surface. aEF