government owned manufacturer formed in 1917 by U.S. Naval Gun Factory Optical Shop Annex in Rochester NY was a WWI U.S. Navy Bureau of Navigation existed from 1862-1942, with activities ranging from charts, navigation research & instruments to Navy personnel management and assignment. The serial number of these Bidox binoculars seem to be outside of the normal expected serial number range of Leitz Bidox binoculars (greater) for unknown reasons. Leitz Bidox binoculars were produced from 1927-1953. The prisms are clearly pencil marked with settings, compatible with training in adjusting prisms, and commonly done in production. The ocular is in a hand removable state (with one missing), rather than being in it’s normal captured fixation, which is likely for a hands on training creation where people are going to remove parts.
Most countries established military binoculars repair programs, and the Bulgarian program used cutaway sectioned binoculars for training technicians. Since those countries had no binoculars to spare for export, some other countries like Chile established new military optical industries. They also used civilian requisitioned binoculars. Countries with existing binoculars and military and civilian optical manufacturing industries such as the US, UK, Japan, Germany and France expanded them and in many cases established new factories. With WWII military mobilization, no country had enough binoculars or other military optics. and were used in the Bulgarian WWII training program of military optical technicians. Leitz Wetzlar 6x30 Bidox cutaway sectioned binoculars were obtained from Bulgaria.
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