Peter asked:
> Serial no. 4220
>
> Any idea of when this might date to?
>
> It's made of Columbus MS, when was that introduced?
>
Here's a data point. I built a lugless track bike of MS (multi-shape) tubing when I was at Santana Cycles in 1985. It was a difficult build as every tube was a different shape!
Cheers,
Mark Ritz
Looks like rain again in Arcata, CA