1. RALEIGH logo 144 bcd cranks - made by SR 2. SR Royal Cranks - made by SR 3. OMAS Cranks - made by SR 4. MAVIC 144 bcd cranks - made SR
I believe all 4 of these cranks are the same thing. They all have exactly the same type of unique fluting on the crank arms, and that fluting first appears in the SR Royal Crankset, circa ~1975 or so.
- Don Gillies
Proud Owner of items #1, #2 above
San Diego, CA, USA