Started new thread on this subject in the hope of identifying more numbers. With a lot of help from Doug (CBguy) on frame identification I have updated the numbering charts seen on the original thread.
A summary of the various numbering systems used by Holdsworth is shown below with more details on Goggle Cloud. This is based on a growing number of frames found on line and information from other websites on the subject. The following are the systems that these numbers seem to fall into.
Pre-War.
Post war 5 Digit numbers and the continuation of this from 1965.
Early 60's 4 Digit numbers (1962-1964).
Shop numbers from 1965 with 1st 2 digits for the year.
Early 70's 4 Digit series (with leading zeros) including branded frames.
6 Digit System from 1976.
The predictions shown are based on the usage of Factory issued numbers and steady production of 1500 frames per year up to 1961 and 1200 frames per year from 1965 when the shop had its own system. 6 Digit numbers have an increasing yearly production up to 1985. The Framework graphs show how this fits around known fixed points in production and frames with good dates or documents to back up their dates.
There are issues with this mainly around shop frames and others that seem to have taken longer to progress through the factory. There are also a few that show up too early, for which I have no real explanation. I have show these on the graphs to indicate the level of accuracy that can be expected with this approach.
All other frames with less clear dating have then been added in where they would occur along with the original description in the Excel sheet. I would be interested in any frame numbers, particularly those with good dates. Hope this is of interest.
https://drive.google.com/drive/folders/ ... TNKZkN4TmM
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On the road: 1991 (Falcon) Holdsworth Professional | 1989 Raleigh Road Ace | Mid 80's Tom Board Lo-Pro | 1980's Roy Thame? Sprint | 1980 Holdsworth Professional SL | 1980 Holdsworth Special | 1969 Holdsworth Italia Sprint | 1958 Holdsworth Monsoon | 1958 Holdsworth Zephyr - shop special| 1953 Claud Butler Olympic Sprint
Others: 1996 CB Criterium | 1982 Holdsworth International Sprint | 1976 Holdsworth Mistral | 1974 Roy Thame Cronometro | 1966 Claud Butler Coureur | 1965 Holdsworth Italia Strava Speciallissimo | 1958 Holdsworth Zephyr - Nervex Pro Lugs | 1958 Zephyr | 1954 Claud Butler Jubilee | 1950 Holdsworth La Quelda | 1948 Claud Butler International Path | 1934 Holdsworth Stelvio