No serial numbers to speak of...
I suspect the way they used large interconnected networks
to build the binoculars in Japan made traceability tough.
Brands like Tasco and Bushnell cover the 50s through today....
so no special clues there.
Magnesium bodies go from the mid-50s to mid-60s.
Really hard to work on without cracking when corroded.
Ah....the Wide Banners with the rotating focus ring.
That occured in a corresponding Sears model too...
I think maybe mid 60s to mid 70s...expensive to make.
Very smooth and good for a fast focus. The little
finger arm often broke off..
Ancient Japan (1940s through 48):
Early (1946---1960) high-quality lenses in:
Stellar, Skyline, Ofuna, Wuest, Super-Power, Sunscope, Kendon,
Mayflower, Mirador, etc..
Here is a 1946--~1955 brand mostly made by Nippon Kogaku (Nikon): Valor
But...there are hundreds of brands, and some appear/disappear.
Japanese binoculars with the branding "Oshman's" are a good example of how
a tycoon's sporting goods store in Texas can use premium payments and
extra QC to carry binocs a cut above in quality. Their 7x35//11-degree looks like
an x-wide Tasco outside, but the focuser arms are more solid, the EP polishing is extra-fine,
and the view is a bit more amazing. Their best was from about 1955 to 1970..
They got sucked up into more famous names at shopping malls and went down with
them later. Corporate heritage supposedly landed them into Dick's Sports
today, but Dick's has a lot of chintzy semi-famous versions, like "by pentax" bins that
not-very-pentax at all....
Eyepiece design from 1948 onward didn't change much:
2,1 precision glass Aspheric up to 70deg afov, usually 2,1,2 Konig for wider.
Very early pocket executive/spy widefields have awesome Erfles in them.
Brands covering 1950s------1980s with extra quality:
Selsi, Tower, Golden Gate, Scope(mid 60s on),
Edited by MartinPond, 17 March 2019 - 11:26 PM.