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extremely rare prototype Elmar without serial number in collapsible M-mount, aperture scale reads from rear to front, black painted front ring, meter scale (caps), similar lenses are illustrated in Paul-Henry van Hasbroeck 'Leica in Colour', page 133, lens no.633015 is illustrated in Lars Netopil 'Prototype Leica' p.273-275 (with chrome front ring) - matching for M3 prototype camera