The rear sight finally cleared customs and arrived. No makers mark or patent info and from an exhaustive research, it appears it could be an early proto-type from some unknown maker. If you know pls chime in.

Elevation scale is not adjustable so ounce I got it set up, 1:1 with the front sight, its roughly at +40, don`t know if its degs, MOA or what ever. Ether way there`s lots of adjustment. It takes 10 clicks to move between scale lines, so fairly precise I would think. More than good enough for .22 work.

Mounting is via the dog-bone safety spring, which was not included. So I fashioned one using a spare dog-bone I had. Involved making a key to match the sights mount, marking it`s position and soldering the key in place.

Based on a picture the seller sent me, the original dog bone was milled and equaled the diameter of the sights mount. My jury rigged one does not however it does hold it securely.

Its mounted and rough zero`d; so I`m off to the range today to give `er a whirl. Will post results on the 22 challenge thread.

In researching this sight, the closest I found was the early "hockey stick" rear sight by Westley Richards. it`s similar and mounts pretty much the same. Patented `1901. Based on how mine is made, I`d recon maybe the same era.