Mystery bracket

[Roger Payne]

It will be an over bore claw mount type set up. The Germans used it very commonly, & many of their WW1 Gewehr 98 sniper's rifles used such a system. The rear leg (ring) had a swan neck curve in it, & that is why the rear base sits to the side of the receiver. If you look at the P'14 sniper's rifle mounts, whilst not identical by any means, they are of a similar general configuration in that the rear base is offset onto the receiver side wall whilst the front base sits on the receiver ring. It will be hard to find a scope that fits as whilst a common general system, they are nearly all just a little different from each other!