Image: NSPU-3 at Tula State Museum of Weapons (cropped)

Description: NSPU-3 (1PN51) night sight. The lever on the aperture cover is set to open
Title: NSPU-3 at Tula State Museum of Weapons (cropped)
Credit: http://vitalykuzmin.net/?q=node/79
Author: Vitaly V. Kuzmin
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