Hi Basil, I did get an answer on another board , this is not my work. but a gentleman that uses the handle Severus Alexander.
None of our experts have chimed in, I see, so I'll offer my 2 cents. The coin most probably depicts Heraclius with Heraclius Constantine. I think there are two possibilities, 1) the Seleucia Isauriae mint, or 2) a Syrian imitation struck by the Sassanids, Pottier Class IV(2).
The Seleucia Isauriae mint should have a mint signature something like SЄLISЧ, but I have certainly seem some wild ones, and a double or overstrike (quite common) could make these look like your coin.
A secondary possibility: the Syrian imitations issued during the Sasanian occupation can vary quite widely, and could look like your coin. I'd suggest looking at Pottier's paper Le monnayage de la Syrie sous l'occupation Perse, available here: https://www.persee.fr/doc/numi_0484-8942_2010_num_6_166_2946
He gave good visuals but I do not have permission to use them.
So he agrees with you but gave another mint possibility.
Thanks for chiming in .