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Interesting stuff, I can see no evidence of an oiler hole having been filled in and it doesn't have semi wrap over stays so I guess that rules cordon bleau out.
Vagner fork crowns seem to have been in use from the 60"s onwards so maybe this at least gives an earliest date of manufacture.
I have been trying look for head badges with holes that match those on the headtube (58 mm). So far I have found holdsworth, claud butler and viking to be the same...
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I have been trying to identify a frame which I believe may be a holdsworth. The classic lightweights website mentions that holdsworth used nervex lugs on the cyclone and hurricane models in the late 50's which had spearpoints added. I was wondering whether that was always the case.
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I think it will be hard to pin it down, it doesn't seem to have any specific features. A chap at L'eroica last year thought it may be a Viking but they had six figure numbers it think.
I'm in Stoke on Trent and the frame was bought from an ebay seller in Macclesfield who didn't know the maker. I have emailed Ellis Briggs with pictures but they say it's not one of theirs. I thought it may be a Holdsworth built Claud Butler but just a guess.