Intended to be used with FED cameras. Normal lens in normal mount but with different engravings. Used with a proper tube the engravings give the relationship between image size and object. Used for document and object reproduction.
Known serial numbers:
2492 ______ new diaphragm scale ____ eBay
3151 ______ old diaphragm scale _____ Jacques coll.
4432 ______ old diaphragm scale _____ geoffox23
6438 ______ old diaphragm scale _____ eBay
8748 ______ old diaphragm scale _____ SovietCams
8892 ______ ? ____________________ eBay
90350 _____ old diaphragm scale _____ eBay
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