My resources of Alexandria provincial coins is fairly limited, but from what I see I think you may be correct. The obverse image of your coin is poor so it is hard to say for sure. What I found as a possible match is RPC 5263:
AE Diobol, Alexandria, Year 8, 61-62 AD. NER KLAU KAIC CEB GER, laureate head right / AUTOKRAT, Roma standing left, holding patera, spear and shield; date LH to left
Sorry. I can't help any more than that.