My girlfriend bought me this 1964 Canon SLR at a flea market in Central Ohio. It uses Canon's short-lived FL mount. Canon came out with this camera and mount a matter of months before SLRs started to be released with TTL(through the lens metering). The mount couldn't be saved and Canon switched to the mount they used into the early 90s. This copy works well and I've been planning on shooting this since the day it was given to me.