I'd want them appraised first if I didn't assign a value myself.
Have not sold any there but watch a usually weekly auction I've sold other stuff on.
I'm allowed one bid per item I list so if a bid doesn't meet my minimum I can bid on it to set a minimum. Or stop the bid if I submit a winning bid. I'd of course need to let the auction know...
Buyers at shops deal with a premium in thier favor. Obviously being in it to make money on a sale and cover thier butts on a buy. That percentage you'd want to know the average of across multiple dealers... This is why selling to an individual can be better IF you trust them, AND know what what you're selling is worth.
I've done some business with Demer in Grand Rapids. (Well , at his former shop.)
Diemer's Coins Jewelry & Collectibles
3939 Plainfield Ave NE, Grand Rapids, MI 49525 ·
And brought one particular dug coin for him to eye.
I'd consider him again , if I didn't find a private individual. But I'm not looking to sell at the moment either.
One guy near me wants too much of a cut or he'd do better. But that's alright too. Long as I know.
So I don't deal with him.