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So sprint rims are 700c as well? I'm glad you mention that you have a feeling it might be a 50s bike, I had similar thoughts especially with a view to the clearance and the lugs. IOn the first page of the thread, I posted a little screenshot of an article about nervex lugs and it says that the newer design (the one with the fish tale) was in use by 1955 whereas the horns were an older design. It doesn't neccessarily mean that it was build in the 50s but I figure that it's possible.
I can't imagine that the frame looked dated when it came out, the parts and the details suggest that it was really special and fancy when it came out. What led me to believe it's from the 60s are the campa record pista components which came out in the 60s afaik as well as the unicanitor saddle (1962-x). On the other hand, they might have been a later addition. Then again there was a falcon racing team with the team colours red and blue which was sponsored by campa and cinelli so it seems plausible that the record gruppo and cinelli bar/stem/saddle are the bike's original equipment.
I would love to know all of its history... all I know is that it's too special to be used and abused so it will only be used on sunny days.This bike has basically the same forks sans chrome and the article says its 1950s. On the other hand, the track ends lug more dated on this one than on mine. on the bottom brack of the falcon, there's the serial number and on the other side of the bb there's a two digit number embossed that looks more or less like a 62. Might be the year of production... who knows.
http://lovelybike.blogspot.de/2013/06/speed-lugs-and-jewel-tones-jrj-grass.html
Probably more likely that it would have had sprint rims with 1" tubulars. 27 x 1-1/4" seemed to be found more on gents' town bikes, some tourers and then on Weinmann equipped drop bar racers in the 70s and 80s. A track bike wouldn't have had them.
The more I look at this, the more I think it's older than 60s. I think it would have looked very dated in the 60s with those early 50s lugs. Things had moved on by then. The slightly bigger clearances would tie it quite well as a 50s frame, as would the fancy chrome and paint.