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This blue/chrome frame certainly looks to be good quality. Had you noticed that it appears to have close clearances? I think the wheels are 27's, but it looks to me as though it was built for sprints and this suggests that the original owner intended to do some serious riding on it.
It certainly looks 1950's and not late in the decade since it has plain looking fork ends - forged ends like campag were becoming common before 1960.
The most interesting point here is that it doesn't appear to be worth much (of course, I might be proved wrong in the next couple of hours) and I imagine this is because it doesn't have a 'brand'. As you say certain makes have extraordinary value - a fairly extreme example being that yellow Saxon twin tube a little further back in this thread: £731! Some people will pay anything for weirdness, and I guess this must be because they have no real intention to ride these machines. And I naively thought that was the main reason to own a bike.
Nice. The prices are so unpredictable at the moment I could see it going for 30 quid. It seems that only hetchins, ephgrave and a few other marques are holding a consistent price.
Here's an interesting ratty one- once chrome frame, Nervex lugs, oil ports... the frame number suggests holdsworth but it doesn't look any I've seen:
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F233013536086