I’m fortunate to be a forum member on the legendary Retrobike, and when this came up the other day, the owner Lee, aka LML999, was kind enough to let me post his pictures here…
This is a Unicorn, I’ve never seen one before,
it’s lug stamps are consistent with the post 95 Masters
but the tubes have no crimps, which did make me question it was a Master
until the owner posted this…
my eyes practically fell outta my head!!!!!!
You can see by the space between the headtube and the lugs it’s a small frame, Lee said 49.5 center to center, so perhaps it was a bespoke order…a stunning piece of work, here’s the original thread
Enjoy Lee, you lucky, lucky man!
Saarf London 
Thanks! I still can’t believe I had the good fortune to pick this frame up. I would love some information on its origins. Who was it built for? Who owned it? Was it raced? Without a serial number, the Colnago factory would not/could not provide any info. Also, note that the frame came unbuilt. I built it with Record 10 components and ride it regularly.
It is a sweetheart of a bike, on the road and off. I will not race it as it’s so special!
Except the blue one which is ridden by Roger De vlaming in 1975 this is the only one, I mean the only steel Cyclocross by Colnago which I ever seen.
Many thanks for sharing the photos.
Thanks Reza! I have not been able to learn anything further about this frame. I do ride it regularly, and it is one of my favorite bikes. I recently sent Ernesto an email inquiring about its history; I’ll follow up with anything I learn!