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So many dilemmas and good i.d. On the chainset, thank you!
Have to get a battery for my verniers so will check that seatpost later
Last owner (in fact the only previous owner) lived in Cornwall, so as too provenance, who knows!
I quite like the odd-ball arrangement so if the frame-n-fork turnout to be gaspipe, will swap everything out to the Pintail. Which, tbh, was the first thought when I spotted this :)
Cheers Clubman, as always!
I've looked closely at your pics, and I agree with the others that you got a bargain.
But what you've got is an odd mixture from some one's parts bin; nothing much matches.
From the point of view of use this doesn't matter - I certainly don't worry about it for my own bikes, but it means there's not likely to be much future in looking for the history.
Just two examples: Nice old GB levers combined with perfectly good Weinmann calipers.
More striking, a Williams C34 chainset (perfectly good, in its way) with that desirable Campag rear mech! No one would have put those two together on a new bike, in any decade.
Indentifying the frame: difficult to impossible, I'd say - you don't even know what area it came from and it hasn't got any really notable features. Better to concentrate on deciding whether you actually like it, and what sort of quality it has. So as you said you would, try it on the road - make allowance for those crappy tyres which would make the best of frames feel sluggish.
As to quality, surely the very first thing to check is the size of the seat pin: 27.2 mm = 531 DB. There are some quality frames with 26.8, but in general below that size forget it, unless it's something of real historical interest.
Anyway you've got some good kit there, the question should be: which suits the frame better, the Williams chainset or the Campag rear mech?