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@lot14
[QUOTE=Hilly Ben;4089820]seat post size will give you the most information
27.2 = top quality frame, Reynolds 531/Columbus SL
26.8 = mid level i.e columbus Aelle(usually)
26.4 = hmmm Belgian half decent but common and you'll never find the builder, or british middle of the road
Not all Reynolds 531 will take a 27.2 seat post. The frame tubing was supplied in various internal diameters so although 27.2 may well be 531 just because it takes a different size does not mean it is not 531.
My own Alan Shorter (made for me in 1963) is double butted 531 with a seat post diameter of 26.8