Can anyone tell me what this is? I inherited from my father in law who used it with his 1947 Zeliss Ikon. It looks like some sort of distance calculator. It was made by DOLLOND.
Can anyone tell me what this is? I inherited from my father in law who used it with his 1947 Zeliss Ikon. It looks like some sort of distance calculator. It was made by DOLLOND.
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