Originally Posted by
rothenfield1
I'm just becoming awakened to them. This one is a 400. I believe the 300's were Ishiwata tubing. The 400 is 531.
Nice looking bike! I would just ride it- but if going for a repair, I'd be inclined to try the tack-weld post/slide-hammer technique described by
loose spoke. That dent doesn't compromise the frame structurally, IME, and is quite common on everyday riders.
Anyway cool bike man.