I believe that the "ears" on your headlugs had disappeared by the 60's along with the pump pegs, but dating Cinellis is sort of a ballpark kind of deal. You can search the archives on CR and it is buried in there somewhere.

It is all good, re-finish or not. I have a few very worn out bikes and after cleaning and polishing I totally dig them. Check out Edward Albert's bikes on Wool Jersey gallery, He gave me alot of tips for preserving patina, and then look at the bikes on the L'eroica site, very cool!

http://www.parcociclisticodelchianti.it/eroica.htm

Have fun,

vjp