Strange vintage lens mount, any ideas?

Strange vintage lens mount, any ideas? I came across this weird lens mount whilst going through a bin. It's not threaded so I guess it's some kind of snap lock on the camera end. But it doesn't fit any of the cameras in the same bin. The lens is a auto vivitar telephoto 40mm 6.3f. the diameter is 41mm. (Yes it's not 42 - double checked)
submitted by /u/Devilofswe

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