wintoid
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Does this one look like a fake? eBay id 160389076989
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Johan: There are no "fake" J-3's around, so the lens you bought must be OK.
I see the lens. That individual had contacted me a year ago and inquired about working on those lenses, but never followed through.
It's near impossible to guess without taking them apart, and even then it is a best guess.
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SO: my guess at looking at the photos: it is a Zeiss optics module set in a J-3 mount that has been custom machined for the knurling. NOT worth $600.