In the end of 1940-s was accepted to service first (except earlier test examples) soviet gun night vision scope – SPN-1 (СПН -снайперский прицел ночной) .
Most collectors know only about NSP-2, which was used with Kalashnikov, many polish copies of it are available at market. But first version of this scope was used with Mosin rifles. Distance of use was up to 200 meters with infrared illumination. Rifle need to be modified with a special base for scope mount.
Unfortunately, real exaples of this scopes are unknown. Periodically user manuals for this scope appear in sale. Here are some pictures from them