Egypt. Alexandria. Antoninus Pius, 138-161. Tetradrachm. (Billon, 23.00 mm, 12.42 g). Dated RY 2 = AD 138/9. [AYT] K T AIΛ AΔP [ANTѠNINOC] Bare-headed bust right; traces of drapery. Rev. ЄTO YC Canopus of Osiris crowned with horns, disk, plumes and uraei standing on cushion right; B (date) right in field. RPC IV, 4.18.23 (this coin cited). Dattari-Savio Plate 109, 2179. Emmett 1373. Geissen 1285-6. Very Fine. From the Dattari Collection. Ex Naville Numismatics Ltd., Auction 42, 22.07.2018, lot 329. Tetradrachm with a magnificent physiognomic portrait of great style of Antoninus Pius on the obverse, with a bare head equipped with a hairstyle with very careful free curls that highlight the nobility of the character. The reverse with the Osiris canopic jar (cfr. nrs. 224, 227 and 236 of this collection) leads us to assume the coin was issued, only during the second reign of Antoninus Pius, 138-139 AD, corresponding in the Egyptian calendar with the end, respectively the beginning of a "sothic period" of 1461 years, falling on 20 June 139 AD, cfr. Staffieri, G. M., Isis-Demetra-Sothis nella monetazione alessandrina, in "Annotazioni Numismatiche" nr. 30, June 1998, pp. 693-697, Milano, 1998.