byzantine gold solidus. Not sure of exact model here but some quick research pulled up prices from $800-1500. Though the relief looks way less in detailed then most of these I have see; almost as if it was an earlier coin, not worn down. So have it looked at by experts. Where did you come across this?
Your coin is similar to those of Heraclius 610-641 AD (in the center) with his sons, Heraclius Constantine, on his right and his other son, Heraclonas on his left. Heraclius is shown with a long beard and moustache, while his two sons are beardless. The pics shown do not reveal the crowns. Heraclius and his elder son would be crowned, but Heraclonas would be uncrowned and wearing a plain cap.
If it is a Heraclius coin, there are (from my count) about 20+ variations. Without first verification of its specific identity, authenticity and variation, citing a value would be premature.
Don......
PS: Welcome to Treasure Net !!
If it were from the 691-693 period, that would be during the reign of Justinian II (685-695). I'm not familiar with any of his coins showing a 'threesome' nor without a mint mark or letters at the base on the reverse--and that raises a 'caution flag' with me.Then again, I'm not an expert, only an old researcher.
Don......
I was examined the coin, it's gold, 24k almost, maybe less a little. the weight a little minus of the original position of the weight-like pieces in that period,Approximate Weight Is 4.10 to 4.18g.