czj 5cm f1.5

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    Leica Carl Zeiss Jena 5cm f1,5 Serial Number Check

    Hello, I have a wartime CZJ Sonnar 5cm f1,5 in Leica Thread Mount serial # 2870001 which seems to date it approx. from 1942. I need advice on how to unscrew the optic module to check for matching serial numbers and perhaps determine it's authenticity. I am loathe to dismantle/damage the lens due...
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