Military sighting telescope.
1916
German machine gun sighting telescope
1914-1918
Machine-gun telescopic sight
Telescopic rifle sight
Large gunsight telescope
Ring and Bead sight
Variable Power Sighting Telescope no.196
German reflector gunsight, REVI.E.2A
Telescopic gunsight in brass patented 1901 by Andrew Ainslie Common
1901