It doesn't look like Windsor lugwork to me, and I used to sell them, but who knows. It definitely doesn't look like a Cinelli. I have in my possession a photograph of Gimondi riding a Chiorda with the Cinelli fastback seatstay design which is why I mentioned Chiorda. Of course, he could be riding a Cinell painted with Chiorda decals. The fotos at the CR site certainly don't cover all the permutations of designs put out by all the various manufacturers. Is the BB eng or Italian? I believe Windsors were english threaded.

In the 70's there was a bike mag called Bike World that did a review of Windsors and said something to the effect that they were as nice a a Cinelli for much less money. Mario Confente wrote a letter to the editor which was published in the next issue that said,"If you think a Windsor is as nice as a Cinelli, you don't know your seattube from a hole in the ground." Very funny.