leica thread mount

This lens came out in 1956 and features "multi-layer achromatic coating". This lens is rare, meaning a few hundred made in Leica mount. It was also available in Minolta's proprietary mount for the Super-35. This is the last lens that I needed to complete a collection of Minolta LTM lenses...

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...