Apaflo wrote:
None of those dates relate at all to the bayonet lens mounts. The Nikon F mount was introduced in 1959, the Canon FD mount in 1971, and the Pentax K mount in 1975. Before that they all used one form or another of screw mount, the Pentax S mount being the most widely known and used.
Canon is the company that decided to be different. Good marketing, and it worked!
Nikon had a bayonet type mount on their rangefinders before 1959. It was just the F mount introduced in 59.