sced,

OP Dave Scrimshaw and I have looked closely at your nice frame, pics of which you've shown in other threads. Believe you've stated it was a Xmas present in 1973. The serial number 69559 points to a WF Holdsworth, Putney shop build. TJ Quick was the shop specials (custom) builder in 1973. His numbers seem to be placed along BB edge. Wonder is that the case with your frame?

From '65 until '75 shop build numbers were prefixed with 2 digits indicating the year of build. Interesting that, "in house" shop custom builds by Collard and later Quick (who took over from him) for some reason continued to have the 69 prefix extending until 1973 (at a rate of approximately 140 frames per year). This places yours c.1973 as suggested by Dave's present prediction that has been evolving over the past several years.
https://drive.google.com/drive/folde...UZYSTNKZkN4TmM

The Mistral was not a model built by the Putney shop and were only built by the Holdsworthy factory although the shop did also retail factory bikes as the Mistral. From prior pics you've shown, I suspect yours is a Cronometro model - a high end shop frame which was built to custom specs. Altho, granted the Cronometro does have some similarities to the Super Mistral fastback. Perhaps showing some repeat pics of your frame would help.

Again, is your frame's serial number on outside edge of BB (believe non drive side)? Your frame and number is an important piece of the Holdsworth serial puzzle.

Below are pics of Cronometro from '67-'68 and '74 "shop" catalogues (Kilgariff).

Doug

1974 Catalogue:



Also Cronometro model seems to be first discussed in another Kilgariff "shop" catalogue page from 1967 / 68: