The bolt on my recently purchased Gew 98 1915 Oberndorf A/N has three s/n's stamped on the root of the bolt handle. The most recent stamping matches the s/n of the rifle. All other parts appear to be matching. The stamping appears to match other factory stamping is size and style. The other two s/n's have been struck through. Could this have been done at the original assembly point of a factory rebuild? I believe this to be a WWI GI bring back as the stock has been duffel cut.