This is a NikkoStirling Mountmaster Telescopic site for target shooting. It is fitted with mounts for, I believe, a Walther Target Rifle. It was used only once by my bother who then gave up shooting because of ill health. It is, in all respects new condition.

It is adjustable from 30 ft. to infinity and 3 to 9 magnifications. The lens is 40mm. diameter.