Like I said still researching these, and other 'pagan' issues and am finding a few holes in current theories. Alfoldi mentions my coin in his book, but only states it is from the Constantine/Licinius era without giving much other info other than he does not believe it is related to the FoI. It is certainly a civic issue, but I will wait to say any more at the moment.
Thanks! It is hefty: 25.67g. Here's the full attribution: "EGYPT, Alexandria. Antoninus Pius. AD 138-161. Æ Drachm (34mm, 25.67 g, 12h). Dated RY 3 (AD 139/140). AVT K • T AIΛ A∆P • ANTωNINOC ЄVCЄB •, bareheaded, draped, and cuirassed bust right / Draped bust right of Sarapis, wearing an ornate kalathos; L Γ (date) across field. Köln –; Dattari (Savio) 8668 (this coin); K&G –; Emmett 1647.3 (R5); Staffieri, Alexandria In Nummis 114 (this coin). EF, dark brown patina with touches of green. From the Giovanni Maria Staffieri Collection, purchased from Dr. Piero Beretta, Milan, November 1972. Ex Dr. Piero Beretta Collection (Milan); Giovanni Dattari Collection, no. 8668."