Nikkor 55mm/1.2 matrix

Serial number Nippon Kogaku Japan Nikon slot screw cross screw lens coating scalloped grip rubber grip AI fork optical formula year of production extra
970001-970110 + - 3 - ? + - - triangular 1? 1965 prototype
970111-985xxx + - 3 - + + - - + 1 1965-1967 threaded aperture ring
184711-195000 + - 3 - + + - - + 1 1967-1968 detachable ring A-2
195001-216000 + - 5 - + + - - + 1 1968-1971 +
220001-243000 - + 5 - + + - - rounded closed 2 1971-1972 +
250001-260000 - + 5 - SC + - - + 2 1972-1973 +
260001-300556 - + - 5 SC + - - + 2 1973-1976 +
350011-385xxx - + - 5 SIC - + + + 3 1976-1977 detachable ring A-1
400001-425xxx - + - 5 SIC - + + rounded open 3 1977-1978 AI
CRT 1 7xxxxx + - - - + + - - - -   39 mm.
CRT 2 8xxxxx + - - - + + - - - -   39 mm. M=1/5
NASA 1 + - 3 - + + - - triangular 1 1969 ?
NASA 2 - + - 5 + - + + rounded open 3 1976 ?
Leica - + - - SIC - - - - 3 ? M-bayonet