I bought the bike early last year after it had been sitting on FB marketplace locally for a long time. It wasn't ID'd as a Holdsworth in the ad, just as a vintage 'custom' bike. I had kind of convinced myself it was worth it for the parts and in communication with the seller he said the person he got it from had told him it was a Holdsworth. Looking close at the photos, geometry, braze-ons, Campy dropouts with portacatena holes, etc, I figured out it was a Pro from around '79. Used the BB# and info on nkilgariff site to confirm. The 2nd gen Cyclone mechs ended up on my Trek build, the Shimano 600 hubs got built into wheels for the Valgan (built up a set with Campy record hubs for this instead- and I may rebuild 'em with tubular rims...). I need to get some new sealed bearing for the Superbe pedals that were on it and move those on. In it's current 'elegant rat-rod' incarnation I'll stick with the 1st gen Cyclones, but if I end up painting it 'Holdsworth orange' I may put the Campy Rally RD I've got on it (and get a Campy FD) to be more true to it's original heritage.
As bought..