Interesting. Yeah these are definitely all are French made. I had a smaller modern ultralight Mitchell for a while, I think it was a 310. Was an ok reel but I sold it at a fishing flea market along with a bunch of other fishing stuff that I didn’t really need. Also had a Mitchell ice reel from the late 80’s that more or less fell apart. I still have the ice rod that came with it and have caught a ton of fish on it.At a glance, all of yours were probably made in France by Garcia. The one's with the wing shaped anti'reverse lever definitely were for sure,
( unless parts have been swapped). Garcia sold the rights to the Mitchell series of reels to Johnson outdoors in 1980, and they sold it to pure fishing in the early 90's. At some point in the 80's, production moved from France to Hi-Fong-Wu, and that's when the plastic bodies, plastic side covers and plastic rotors destroyed the most iconic reel in the history of the sport.
IIRC the 308 was the midsize and the 310 was ultralight. They also made a 304 that was a full size spool on a compact body. My dad caught one of those off the bottom of the lake. We used it for years and years and eventually it went back to the bottom of the lake lol.
My dad also had a Mitchell 440 which was a geared down version of the 300. It was actually too slow for fishing IMO. If a fish made a run at the boat you couldn’t reel fast enough to pick up the slack. That went at the fishing sale too.