Shhhhh! I snuck out early!

I don't think these timelines are very useful insofar as they are never perfectly accurate and don't recognize the fact that Cinelli was very small and all it took was for Valsassina to wake up on the wrong/right side of the bed one day to make a modification for one or perhaps a few dozen bikes. Likewise,, it wasn't as if he decided that he absolutely had to build all his frames identically. Back in the day, you used to buy the knowledge and skill of the builder and not a bike "model".

Post the photos and I will take a look. Show the rear drop-outs, seat lug, bottom bracket shell (top and bottom view), head lugs, fork crown and then at least one overview.