Drillium Dude 

Perhaps a crash necessitated a new fork and maybe even a bit of a frame tweak. Taking advantage of this, the frame was modded then finished with a new metallic paint approximating Celeste. The paint was either not up to the task or the bike was ridden hard and put away wet more than a few times. Oof. I'd like to see a pic of the internal routing transitions - do they use stylized fittings or is it flush with the tubing? If done well, the main triangle is a quality piece, but the ride will always be the determining factor - and may not be as good as intended without an original fork.

Regarding the SN location/format: mine has been ID'd as a Specialissima from 1981, with SN stamped into the BB shell. It sports the "waving flag" Made in Italy decal but no model name. As I understand it, the Specialissima moniker was applied to framesets only, while Super Corsa and Super Leggera models were complete bikes; the frames materials, paint and chrome were to identical specification.

Some detail photos of what's been identified as an '81 Specialissima:







The brake bridge is a Gippiemme item and uses a separate threaded insert. It looks as though it will allow for either nutted or recessed application; the piece is on the right:











DD