That's a real beautiful example of an early Master.

I am a bit befuddled by the non aero brakes and the handlbars though, both of which harken back to the 70's/early 80's, which is before the Master came out. I believe the earliest Masters came out in the late 80's. The earliest Masters did come with the curved fork however, so that is correct.

Then there is the rear spacing. Why would it be a 130 spread for what looks like a 6 speed cog?

I'm not picking on this bike at all, just wondering. The Master came out in so many different iterations its hard to nail down all the details. I don't think Colnago's used serial numbers so that is no help either.

I say ride the heck out of this beauty and enjoy the ride!