Leica X-Ray Camera ca.1930. very RARE

Rare modified chrome Leica Standard camera for 24x24mm exposures, with retard lever next to the 'Z' engraved shutter dial. The shutter dial can’t be set to any other shutter speed. Also the second shutter blind is not present, as it should be. Please refer to James L. Lager Volume I on page 162. In beautiful, near-mint condition, including SCNOO rapid winder and Xenon 1.5/5cm no.426351.