The Voigtlander Color-Skoparex 35mm f/2.8 is a wide-angle prime lens for 35mm SLR Rollei SL35 cameras.
The lens is the exact copy of the Carl Zeiss Distagon 35/2.8, manufactured by Rollei under the license agreement with Carl Zeiss. For the Voigtlander VSL 1 camera(screw mount variant) it was manufactured with the M42 mount, for the Voigtlander VSL 1 (bayonet mount), VSL 2 and VSL 3-E cameras - with the Rollei QBM mount. The lens, alongside with the above mentioned cameras, was manufactured at Rollei works in Singapore.
The lens shouldn't be confused with the Voigtlander Color-Skoparex AR 35mm f/2.8, manufactured since 1977 in Japan by Mamiya. The lenses and their optical schemes are quite different.