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Those Osgear drop outs were the first thing that made me think it was 40s and then those lugs.
Found a picture of a 48' Avant Coureur which is a good match for the listed frame but the 48' doesn't have the Osgear drop outs , so maybe the ebay frame is a little older ?
I like it but it's too big for me by the look of it and I've contacted the seller and they won't entertain posting it.
Listed as a Claud Butler Cresta but looks far better to me. The ad also has it as 60cm but looks far smaller.
I think it's far older than a Cresta and probably from the late 40s and looks like it could be a Bilaminate frame and the model being a Avant Coureur or New allrounder but I'm no expert -
http://www.classiclightweights.co.uk/builders/cb-bilam-vincent.html
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F143016437068
Collection only from Doncaster.