Italian mystery frame

This frame, seen above in my delux spraying facility, has been on the inventory for nearly 18 months without much action. I decided to make it presentable and use it as a road fixie instead of the Holdsworth which is in dire need of refurbishment.

Except for lack of an Italian thread bottom bracket for TA Cyclotouriste cranks it could be rideable by the end of the week. Now that the summer weather has packed up, I have already polished up a set of Universal 61 calipers, and the weird Nitor seatpost that came with the frame.

Despite an appeal to the collective wisdom of the CR List, I don't know anything about this frame, except that it is Italian, probably mid-50s to mid-60s.
A number of Italian brands of the period used a similar seatlug, including Frejus, Olmo, Torpado, Galmozzi, & Girardengo but the headlugs don't match any of these.
If I don't get a positive ID soonish, I'm going to call it Esposito.

More details and photos are at my Wooljersey album.

Please email if you have any thoughts as to the identity of this frame.

Thanks to Robert S Broderick for the Nitor seatpost image, which I stole from his excellent gallery of catalog scans on Wooljersey.