Question for the experts: Does one normally expect to find a Reynolds stamping on the tubing of an assembled frame? Specifically, while sanding-down my 1960s Tigra (for a redux), I found stamped on both the down tube and top tube the word "REYNOLDS" and on the down tube added "REYNOLDS 531 ??? 20/23." I had not seen that before, and have relied on others to identify whether a bike was indeed built of 531 - if the decals were missing. So again, is it usual or unusal for such a stamping.
(I assume the 20/23 means inside and outside diameter of the tube, but??
Thanks,
JB Froke
Pebble Beach, CA