I believe that Booker T used an M3 for his whole career as a Hammond player. The M3 was the studio house organ at Stax Records in Memphis, so all the Booker T and the MG's recordings,
PLUS,
ALL the Otis Redding, Wilson Picket, Albert King, etc. that were recorded at Stax, where recorded with an M3, not a B3 or other Hammond organ models.
I believe Keith Emerson also used an M3 for his whole career too. Ritchie 200/Jimbo you out there?
I had a good friend, Kenny Sadick, years ago when I was hanging out at some of the blues bars in Chicago who played an M3 . He played for Lonnie Brooks for many years with a cut down M3 and a Leslie. Lonnie Brooks was from Texas and was know there as Guitar Jr. but had to go back to LB because when he came to Chgo. there was already a Guitar Jr. Lonnie actually played at Johnny and Edgar Winters high school sox hops when they were kids and they where crazy about his playing and singing.
He played on at least 2 JW albums for Chgo. based Alligator Records (the whole album) in the 90's but did not go out on the road with him because of road money limits for JW.
If you don't play keyboards
PLEASE sell them to someone who will. Then you can buy many more iron sets and chassis then just the few you have now.
Those "tone wheel" organs
WILL NEVER BE MADE AGAIN because of the price to build them.
Brad