Super-Angulon 4/21mm prototype sample

Leitz Super-Angulon in M39 mount, made in an experimental batch of only three lenses (serial numbers 11805803–11805805) and recorded in the Schneider production books as Leitz-Muster (Leitz sample). Remarkably, production of the 21mm f/4 Super-Angulon had officially ceased in 1963, yet this example was produced in 1971 – at a time when Leica no longer manufactured screw-mount cameras. In near-mint condition, complete with both caps.