I believe these cameras are highly underrated, they brandish a 2.8 Tessar (50 or 45mm), a Pronto Shutter (several flavors) and some have rangefinders.
They are well built, and after 40+ years I have found that most lightmeters work after a little cleanup

The lineage contains the following (original Websiote is defunct) :
Zeiss Nbr Model Years Lens Shutter Notes
10.0639 LBE 1965-1967 f2.8 50mm Tessar Prontor 500 LK range finder
10.0637 LK 1963-1965 f2.8 50mm Tessar Prontor 500 LK view finder
10.0638 LKE 1963-1965 f2.8 50mm Tessar Prontor 500 LK similar to LK but with range finder
10.0351 S-310 1971 f2.8 40mm Tessar Prontor 500 S viewfinder
10.0354 S-312 1971 f2.8 40mm Tessar Prontor 500 S similar to S-310 but with range finder
Contessamat 1964-1965 f2.8 45mm Color Pantar Prontormatic viewfinder
10.0652 Contessamat SBE 1963-1967 f2.8 50mm Tessar P-matic 500SL rangefinder
10.0654 Contessamat SE 1963-1965 f2.8 45mm Color Pantar Prontormatic 500 rangefinder
Contessamat STE 1965 f2.8 50mm Tessar P-matic 500SL rangefinder
Contessamatic 1960-1961 f2.8 50mm Tessar Prontor SLK viewfinder
10.0645 Contessamatic E 1960-1963 f2.8 50mm Tessar Pr SLK Spezial range finder
Any more comments on these?
