It has a serial number on the bottom bracket, punched with a die set, that appears to say 6224.

I am curious about which model it is, and what year. I rode it around Europe and brought it back to NC, CT, MA, and now back to NC. I bought a used Holdsworth in a market in Amsterdam in June, 1974. I would be interested in any frame numbers, particularly those with good dates. I have show these on the graphs to indicate the level of accuracy that can be expected with this approach.Īll other frames with less clear dating have then been added in where they would occur along with the original description in the Excel sheet. There are also a few that show up too early, for which I have no real explanation. There are issues with this mainly around shop frames and others that seem to have taken longer to progress through the factory. 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. 6 Digit numbers have and increasing yearly production up to 1985. The predictions shown are based on the usage of Factory issued numbers and steady production of 1500 frames per year up to 19 frames per year from 1965 when the shop had its own system. Shop numbers from 1965 with 1st 2 digits for the year.Įarly 70's 4 Digit series (with leading zeros) including branded frames. Post war 5 Digit numbers and the continuation of this from 1965. The following are the systems that these numbers seem to fall into. This is based on a growing number of frames found on line and information from other websites on the subject. With a lot of help from Doug (CBguy) on frame identification I have updated the numbering charts seen on the original thread.Ī summary of the various numbering systems used by Holdsworth is shown below with more details on Goggle Cloud. Started new thread on this subject in the hope or identifying more numbers.

Holdsworth bike serial number