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Porro-type prismatic monocular by J. G. Hofmann of Paris. marked 'L'Institut d'Optique de J.G. Hofmann

Porro-type prismatic monocular by J. G. Hofmann of Paris. marked 'L'Institut d'Optique de J.G. Hofmann

1865-1875
Prismatic monocular No.4308 by the Precision Optical Co Ltd

Prismatic monocular No.4308 by the Precision Optical Co Ltd

1917
Ex-Government inra-red monocular

Ex-Government inra-red monocular

Monocular prismatic field glass, with exposed optical components, on stand, unsigned, United Kingdom, 1880-1905

Monocular prismatic field glass

1880-1905