It's a Gran Premio, I only dug the headset out from the shed, the frame came from a guy in Eindhovan, Chesini sent bare frames and they were painted by Frank Hoste the tubing is a mystery, may be nothing special, but the frame is light, forks are heavy,(maybe the steerer) I have read the tubes were produced by Colombus especially for Chesini, I have also read Oria tubes were used.What model of Chesini is it?
I absolutely love mine and just glad you have dug yours out the shed and will be riding it.
Needs a quill stem.
Nicely done, although a purple-y saddle may suit it better. Fabric and SDG do them.