OK, I took a look at the Cinelli and the (I think it's a) Windsor side-by -side.
The seat stay ends are different at the seat cluster per Chuck's earlier post (sharper radius on the Windsor where the flat portion ends and full diameter stay begins).
The only number on my Windsor is an "084" on the left side of the seat lug (didn't pull the fork though...).
The lugs carry the three-hole motif through to the bottom spoons, whereas the Cinelli has only one larger hole in those areas.
The BBs are completely different: stamped, plain-looking one on the Windsor, Cinelli-esque (big surprise) on the Cinelli. Fork crowns are also completely different: internal Cinelli full-sloping on the Cinelli ('natch), and external semi-sloping on the Windsor.
Wheelbases: 41.25" (!!!) on the 58 cm Windsor, 40" on the 60 cm Cinelli. Both bikes are 120 mm rear spacing, and have 1010 dropouts without eyelets.
Both forks have rifled steerers.
Is my "Windsor" really a Windsor Pro, or some other Cinelli wanna-be?
Also, the Cinelli is decaled "Speciale Corsa." Was there a clear cutoff between that and "Super Corsa?" Apologies if this is an old issue....
Greg Parker
A2 MI USA