Remove the wheels and take a close-up photo of the front and rear dropouts.
Also a photo of the bottom side of the bottom bracket.

It appears as if your frame has been repainted at some point. I very much doubt that it is a "Master Olympic".
The fork is probably a fairly late model Colnago fork.

I like the lower head tube cutout, but I would expect more than just the one. And, the seat-stays ends don't particularly look "Colnago".

The handlebar stem pantograph appears to be "added", and is probably NOT Colnago.