My guess is "M" = Motor Wheel Corporation. They made hub piloted rims that used a flanged nut to hold the rim to the hub.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD