Originally Posted by paredown

I'm with the folks that dated it to the mid to late-60s--take a look at the Cinelli timeline on Velo-Retro--yours still has the fender eyelets and I think I am seeing the anchor hole for the Cinelli Grand Sport. I do think the crank is original (the one I raced on BITD was similar vintage & same crank); I also think it is a repaint. Headset looks original as well (Magistroni?)

(Can't post a link for Velo Retro because I have not posted much here, but you will find it easy enough).

If you look on the rear mech you should see a date code on the top where the cable enters, you should see 'Patent XX' which will tell you the year--if old enough, it may be original: