Holdsworth 531 special

[DutchIron]

Hi All, I'd like to find out more about this bike, which I suspect is from the 1970's. It all started with the Holdsworth-Campagnolo cap when I decided to buy a bike to go with my cap! I bought the frame on ebay in 2017 from someone living near Southampton. The components came from various bike fairs and are all Campagnolo except for the bottom bracket (Shimano) and the brake levers (Weinmann). There's a frame number on the BB that looks like 0357, Could that be 1973? The frame has no lugs for the shifters nor guides for the gear cables. I can't find any date markings on the Campag components. On the back of the cranks is stamped "170 strada 7" , with the 7 enclosed in a diamond shape.
Any comment or tips?

 

[Midlife]

Nice Classic chamfered seat stays of the Special...

Does Nick Kilgarrif website still work? there was a lot of Holdsworth info on there. the 7 in a diamond is the date of the cranks.

 

[pigman]

Lots of good database info on here

Thread 'Holdsworth Frame Numbers'

Jan 24, 2017

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...

• dwscrimshaw
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• Forum: Retro Classic Road