AE Drachm,
34 mm, 20.64 g, 11h, Alexandria mint, Regnal Year 13/CE 149-150
Milne 2054
var.
Emmett 1621
var.
O: laur
draped bust right, AVTKTAIΛAΔP/ANTωNINOCCEBE/VC
R: Serapis
std l inside a temple, TPICKAIIς
The Greek "16" after the date is supposed to have recorded the number of Cubits the Nile rose that year, 16 cubits being 7.315 meters or 24 feet which appears to be about average for lower Egypt.
Ex: CNG 418 (11 April 2018) portion of lot 662