PAUL - Bill DeTurck has the only M&W 9-speed installed in his Original that I know of. Seems like I heard of one other years ago.... Maybe Charlie has it now.
I think Bill posted someplace, maybe at RPM's forum or Only CC's the total number of M&W 9-speeds may be as low as 50.
They were a nice little unit, compact, a creeper and over-drive all in one. I had the M&W brochure on them and the frt mounted rough cut mower M&W designed but only ever built about TWO of years ago. It listed the gear speeds, seemed like high 3rd was 10-11 mph. You'd have to have pretty tight steering to keep a CC that fast on track.
MARLIN - Dad's first loader was a CASWELL. I'm sure you remember them. HUGE hyd. cyl. mounted in frt of the tractor's grill, crossed chains to raise/lower the loader arms & bucket. In about the 1960/1962 time frame Dad got the Stan-Hoist that's sitting along side the shop now. The M was converted to live 2-way hyd. with the M&W kit. It was a huge improvement over the Caswell, but not quite built strong enough to survive the M. Lots of welding has been done to the mounts & frame of the loader.
The front cylinder mount from the Caswell has been "recycled" several times. It was the frt weight bracket for the 450 Farmall when the 4-bottom fully mounted Fast-Hitch plow was being used, and is now the frt mounting bracket for the loader on the Super H. Hard telling what the rest of that old loader was used to make. When you have a welder you NEVER throw any steel away.