>>> If I remember the quad and triple butted tubing was seamed
>>> and could not be made by the seamless method with mandrels.
Joe, I think the Ishiwata triple-butted tubing was available in both the seamed and seamless varieties.
For an out-of-timeline example, the 1992 Bridgestone RB-2 was made with seamed Ishiwata triple-butted, while the more expensive RB-1 was made with seamless Ishiwata triple-butted. At least that's the way I'm remembering the Bridgestone catalog's presentation. (Grant? You there?)
But I don't know about other tubing brands, or earlier examples. I suspect, though, that Fuji's quad-butted Valite was NOT seamless. . . .
nath dresser
spring green, wi