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Mapei said:
I say it's a 53. It looks the same as my 53mm Dream. On mine, the distance is about the width of my thumb. You must remember, though, that Colnago measures seat tubes center-to-top. A 53 is the equivalent to a 52.
Actually, a 53 is about the equivalent of a 51. I think Colnago provides the C-C measurement in the geometry chart, or at least they did at one point.

I've got a 53 traditional C50 and I'll second, third, whoever is saying it is a 53. The width between the tubes for me is just enough to put my thumb in as already mentioned.

Ask the seller for a headtube measurement. This is usually the tell tale measurement for the frame and the measurement they can screw up the least.
 
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