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They look identical to my old Japanese binoculars, but mine are branded completely differently - "Birnie" I think. And Jen brought a set of old 7x50 binoculars to last SVAA camp - again identical, but a different brand name.
Good enough for me as a child and they got me astronomy late in 2006 when I pointed them at Jupiter and the Jewel Box. Also seems to have a nice coating on the outside of the objective lens - I remember using them at night - but looking terrestrially - amazing what I could see in the "dark".
Apart from that, I don't know anything. I haven't tried to pull mine apart. No visible mould after some 45 years!
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