The old N-Fords had PTO’s that were direct-drive and overrun clutch’s were a safety-requirement …unless you wanted the shredder to push you into a tree …or whatever. (the PTO was connected to the final-drive…and a shredder would drive the tractor regardless of whether the clutch was pushed “in” or not…

… so you
definitely wanted an overrunning clutch!
(It might be an easy thing to check: With the tractor NOT running…and the PTO engaged…. see if you can twist the PTO-shaft clockwise by hand…. If so, then it will be free-wheeling (over-ridden).
The modern tractors usually have it built-in… the implement cannot usually drive/propel the tractor.
My Kubota’s Owner Manual recommends the PTO only be engaged and dis-engaged at “reduced throttle”.… presumably for safety as well as to avoid unnecessary PTO-clutch wear.
