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Leica built the M4 from 1967 to 1975, order number 10400, to a total of roughly 60,700 cameras. It brought the angled rapid-rewind crank and the three-prong quick-load take-up spool to the M, on brass top and base plates, with a 0.72x finder carrying 35, 50, 90 and 135mm framelines and a cloth shutter to 1/1000s. This body has been modified outside the factory so that a vintage Leicavit rapid-wind base can be fitted, which a standard M4 does not accept.