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extremely rare and fully original 1.4/5cm prototype marked 'V.1930 Nr.6' made by Carl Zeiss Jena in 1930, in black painted brass barrel with iris diaphragm to 8, rear part engraved with identical serial number, listed in Thiele's register as a Sonnar prototype, special lens which never went into production (Zeiss made 5cm lenses only with f/1.5) - ex Barringer collection