Some but not all of these have devices left and/or right of the flames. Yours does which should help someone who knows the series add details. I am not that person. Your photo makes the coin look polished losing details. A darker photo might help. Mine is different in those details but the only references I have are worthless for these.
Looks OK to me. Sasanian Kingdom, Shapur I (241-272 A.D.) AR drachm O: Bust of Shapur I right, wearing diadem and decorated tiara terminating in eagle head. R: Fire altar flanked by two attendants wearing diadems and mural crowns. 4.33g Göbl type I/1
The coin looks fine to me, but I'm not expert enough to give you any further info about it at a glance.
How about a SHAPUR I bronze version... Sassanian Shapur I 240-272 CE AE Tetradrachm 10.78g 27mm Ctesiphon mint phase 1a mural crown korymbos - fire altar type 2 SNS IIa1-1a
OP coin looks authentic as far as I can tell. Not sure of the mint or date range on this, as these facts were not explicitly spelled out yet. (There are some symbols in the reverse field that can be used to ID to specific mints, but I am not a specialist in the series so I can't help there, sorry.) Another cool fact: Shapur I issued some drachms of low silver purity, in addition to the usual high-silver-content coins. Gobl explains these by suggesting Shapur acquired a number of base silver blanks for antoniniani when he conquered Antioch, and had those flans struck into drachms. I have one of these Roman/Sasanian coins:
I don't have one of these. I have been looking for a nice one, within budget, to sit along side my Valerian I. It seems a bit mean, but he will never know.
What cool coins. I don't recall ever owning any Sassanians. In fact, with the exception of one Parthian coin and a few Chinese and Byzantine, I have yet to explore much beyond Classical Greece and Rome in the ancient coins.
