Price check used Heym

What's a used heym with worn bluing on the barrels worth these days?

450, 470 or 500 NE
Ejector
Pin less sidelock
Moderate portrait engraving
NOT a jumbo model
Claw mounts with premium scope
NOT with the extractor selection switch

Trying to assess fair market value as I contemplate a purchase. Price books are all over the place. This one is in roughly 90% condition. (A $1000 would restore it back to near mint as its been carried on a hunt or two)

Thanks!