Originally Posted by Charles Wahl

The "butted frame tubes" means only that the frame main triangle is 531 butted (the seat tube probably single butted -- no butt at the top if a 27.2 mm seat post fits). It probably means that the rear chain and seat stays are not R531, but doesn't mean that the fork blades are not -- I have a 1972 Raleigh Competition with exactly that seat tube decal, but the fork blades also have the triangular "531 forks" decals.