Nikon F3. Just a beast of a camera. In production from 1980 to 2001, even after its replacements, the F4 and then F5 were brought to market. Solid, smooth, versatile. Everything one needs, and nothing more.
Nikon F2 with non metered prism. WONDERFUL. Smoother mirror movement than the original F. Introduced about 1972 to combat the Canon F1. Because of the 1959 lens mount, meter coupling was external. They have finally gotten around this with the digital models.