Is it truly Columbus tubing?
I've recently run into an 80's steel mtb frame at the local shop. A Columbus off road/triplo spessore decal has been placed on the seat tube of the bike. The mechanic claims the seat tube, top tube and perhaps the down tube are Columbus steel. I've seen Columbus decals for sale on ebay so I'm a bit unsure what to think.
How can I found out if the frame is indeed Columbus tubing?
Is there a way to detect triple butted (triplo spessore) welds?