Scope looks post war, 50's or 60's era to me. Mounts are high turret mounts, 26.5mm tube, but no telling when they were put on the rifle. You can buy originals and reproductions today.
I would buy it as a collection of parts, and honestly if the rifle is all matching and the scope mounts are not original/correct, I think it hurts the value of the rifle. Looks like inconsistent finish on the bolt shroud vs. the rest of the rifle, too.
For whatever reason, WWII German stuff seems to be the thing to fake, and there's lots of stuff out there that's not original, fudged, etc... I run away at the first sign of questionability, especially over the internet. In person if I can verify what's what it's a little different, but it seems to be everyone has Nazi SS sniper rifles worth at least $5000....