Is it a M-mount or LTM take-up spool

I just put a Leitz take-up spool up for sale in the classifieds and I realize that I don't know if its for a screwmount body or an M-mount. Can someone tell me the difference? The one I'm selling is labeled Leitz-Canada (did they only make M-mount bodies in Canada?) and the protruding shaft pushes in and out on a spring.

Thanks.

I think that's for an M 2 or 3. Joe