Lloyd3,
I think you still don't understand, there is nothing wrong with the gun or the marking. If you post a photo of all the markings on the rifle barrel, I can explain them. If you can't post a photo, fire an 8x57IR (sometimes called JR) and if it doesn't expand unusually large, that will show 8x57IR is the correct nominal caliber. Not only was 8x57IR a very popular caliber, but it was a very good one as well and should not hinder its sale.
Mike