All lenses for these mounts are interchangeable between older and newer Minolta manual focus 35mm film SLR bodies. There are exceptions, such as, the lenses before 1961 feature a slightly different aperture leverage, and thus the automatic diaphragm may not work correctly on post-1961 cameras, and later MC/MD tabs may hit the pentaprism housing on one earlier camera. Four design enhancements, all forwardly inclusive and backwardly compatible, are:
SR - 1958-1966: Plain SR-bayonet featuring automatic diaphragm. Lenses are labelled Rokkor (pre-set) or Auto Rokkor (automatic diaphragm)
MC - 1966-1977: Meter coupling added (often called MC mount) allowing full-aperture TTL measurement. Lenses are labelled MC Rokkor.
MD - 1977-2001: MD lever added, which allows the reading of the smallest available aperture, often referred to as MD mount. Lenses are labelled MD or MD Rokkor (or MD Rokkor-X in North American markets.)
MD X-600 - 1983-1998: X-600 mount extension reporting the maximum aperture of the lens to the camera body, which then engaged different auto focus confirmation sensors in the camera body.