Looks like the code got mixed up. I imagine the original price was €1297 and they want to sell it for €790. If you’re willing to pay €790 you should contact them and point it out and you may be able to get the deal.
@JayAg47 apparently your not familiar with the the new math. Just as grading works in the favor of the dealer when you sell your coins, so do discounts. Besides to paraphrase, the more you buy, the cheaper they get.
What do you think is a reasonable price? I've seen them range from 800-1500 USD, although I'd like to get a Solidus of Justinian for around 1000 AUD sometime in the future.
It strike is a little flat. So I'd say this is "average" for the type. Or maybe it's just that I don't like the style of gold Byzantines lol. I certainly wouldn't pay more than 1000 AUD.
You should be able to get a better example at an auction for 450-550 €. I paid 400 for this one last year:
