What an amazing stroke of luck and a beautiful bike - I have spent the last 2 years on exactly the same project - building a silver early 70's Cinelli SC - it took me a year to find a '72 frame (a size too big but I figured I could live with that) and I am still looking for some items to complete the build. To have an all original bike handed over - what a dream!

In terms of the vintage my research would tell me that it is no later than a '73 - all the photos I have found of SC's up to '73 had the Columbus downtube sticker you have (Garantiti in bold on the bottom line and gold metallic foil colour) whilst 74 onwards had a different version with Columbus in bold on the bottom line and the sticker is a flat gold colour. I cannot give an accurate earliest likely date although the brake calipers are stamped with Campagnolo rather than blank like the first edition Record version so I would say '69 to '73. The Patent number on the RD will likely give you the year.

I really look forward to watching the project unfold in someones hands.