I'd say 1980 Windsor Touring Elite and that yours was resprayed to that fade paint job. I have one in cobalt blue in very good condition; perhaps in same size, tho I seem to remember it as a 57. Mine has the same components, minus the campy headset. Mine has a columbus tubing decal on the seat tube. No indication on decal of SL or SP. It's a really nice rider with decent clearances for fenders and fatter 700c tires if you go that way. I'll try to post some pictures of mine.

While the last thing you might need is another frameset, I'm looking to sell this Windsor ($125 + shipping). You could transfer over your parts after treating them with a rust removal solution. Good luck with your projects!