How to identify / estimate the production dates of vintage binoculars?

British:

Barr & Stround binoculars (1932 – 1971)

Barr & Stroud Binoculars (1950 – 1971)

ROSS binoculars

British binoculars from the 1950s and 1960s

WRAY OPTICAL WORKS

Vintage British binoculars from this store

German:

Carl Zeiss Jena

Zeiss History

C.P. Goerz Berlin Trieder Binocle

Goerz Optics

Voigtlander (Note: this link is for Voigtlander lenses. Information to be updated for binoculars)

Vintage German binoculars from this store

USA:

Bausch & Lomb serial numbers

Bausch & Lomb date code (serial number scheme)

US WW2 military binoculars from this store

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