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Happy to be corrected, but I have to say this dose not fit nicely with any Holdsworth or RT numbers. I see the wrap over stay and the Club shaped cutouts in the lugs; RT did use these, but most of the examples I have seen had Holdsworth shop numbers, ths frame hasn't. RT used shop numbers up to...

That frame number would suggest a Holdsworth Built CB from 1963. Looking at the catalog for that year it could be a Coureur or European. The other models have different lugs and these two could come in Flamboyant Orange. Looks like it has had the lugs over sprayed at some point. Might be worth...

Looking at the number & its location I would suggest an early Holdsworth built CB from 1959. That said not sure I can ID the model, those window in the head lugs are distinctive, but not common for any model that year. Maybe other can comment.

That number would be a shop build from 1966 as you say. the K can either be stock build or special depending on you point of view as a lot of frame I have found with a K are far from "stock" items. Interestingly the letter is at the start on this number?

They could well have done, that is an unbranded basic drop out. The head badge holes would also be common between CB and Holdsworth I think.

This is the numbers I have listed for 1936/46. As you can see the 1946 numbers are significantly higher than 36 and in Feb were already at 2000+ which makes me think they carried over from 1945 which was at ~1600 in Oct that year. The end of the war could explain the inconsistency, but that a...

Yes could well be. Those eyes for the cables are also seen on Shop Built Holdsworths so could have been a modification at some point. These is also a group of Holdsworth numbers using 4 digits from the early sixties when they made a brief break from the traditional 5 Digit numbers of the time. I...

Thanks for the number

yes, that's 44/15 as I was using up some old components. Just been for a ride on the road and its better for a casual run. I have been using 46/14 on the track and thinking of going to 13t on the rear as I was running out of RPM last week. Not on this bike I might add

First try out at the track. Went ok, bit heavy and low geared. Had to tighten the nut under the seat to hopefully make it more comfortable and stop it sagging. Nice ride though, keeping an eye out for signs of cracking again on the frame top tube.

Yes, I did see that one, passed on it as I have exactly the same issue with a RT Crono to sort out after my daughter took a trip down a pot hole. The RT is definitely worth repairing, but probably at a shop.

Finished the painting, ready to go together.

Thanks, I have to say I started by assuming the two systems didn't coexist and it was a clean switch over and back again. But, nothing ever seems to be that simple and I guess the honest answer is, we will never really know. I think it would be fair to assume it was a fairly clean switch over to...

Making progress, bit rough in places! I think it will be a case of ride and look out for cracks in the paint!

It may well end up that way! I guess as I don't rally need another bike I only intend to build it up with spares, could end up as 'garage art' for most the time.

Got this frame a while back as it was cheap having a crack in the TT and no forks. Strangely found the matching forks on eBay and after some haggling they still cost me more than the frame. I was told the bars hit the frame and cracked it, bit odd as not dents, I guess it fatigued. There are...

I have to say that looks like a Holdsworth 4D number from 1963. Its an odd bunch of numbers and does already include a number of CB Classique's. Initially this group was thought to be a change of numbering in the early 60's for a couple of years before they resumed the 5D numbers again. There...

To answer PS first it was a club night on this occasion, a couple of people I know well were impressed how light and simple/clean it was. I'll get more reaction on future track nights in the summer, but they have come to expect me to tune up on something old and unusual. I'll probably get the...

All done, going for a spin out at the track tonight. I was aiming for 6.5kg its come in at 6.6kg so not too bad.

Yes, looks like another one to add to the growing list. Thanks