Re:
I see you have a Montello. I also have an early one, probably made in '84.
Could you give me the serial number of yours, I'm trying to decipher the Pinarello's s/n system in the '80s. Are you the first owner of a bicycle? What information do you have for '88?
Edit: Now I see the link with the pictures. 1B8??.
But I see an interesting thing on your bike. The Columbus sticker is an SL tube sticker, not the red-framed SLX, which is common on Montellos.
On an another vintage cycling forum runs a topic that deals with the existence of SL tube Montello. According to the latest information, SL-tube Montellos are marketed only in Europe.
Maybe are you from Europe? Or the previous owner of the bike was European? When you renovating, did you inspect the SLX-ribs at the BB shell inside the tubes?