Israeli Mauser on a GEW 98 Value

I am considering selling this one and want to know what a fair price is.

The base rifle is a 1916 Spandu Gew 98.

It has the 1920 Wiemar mark - mostly obscured by the 7.62 marking.

The the original receiver proofs are still in existence, there are a few waffenmarks (Rear sight bayonet mount), and what looks like an odd eagle on the crossbolt.

The numbers are not matching.

Has "bolt on" scout rail on it to help my old eyes I have the original rear sight

As I am not a expert on judging bore condition, I would guess fair to good

Link to an Imgur album of photos

http://imgur.com/a/RrpRE