The numbers on the BB align with the spindle. When new it looked a lot like Chronometro in the picture except it was metallic azure blue with red panels, and half chrome forks and stays that were standard for the Super Mistral Fastback ( https://www.nkilgariff.com/HoldsCats...ral_Frames.jpg ). I lived in Norfolk VA at the time where the surrounding area around is very flat. My dad was a Navy pilot and we'd moved to Norfolk in 1969 after 3 years in England.

My Holdsworth was a 1972 Xmas present to replace a very similar, but smaller, Kenistons which I'd outgrown and sold to a friend. I didn't actually receive the bike until the fall of 1973 because Campagnolo had a protracted strike and parts were unavailable. I think Holdsworth was the UK distributor for Campagnolo at the time.

I ordered a 5spd and it came with a pista crank and 54t chainring, and lightweight wheels with Super Champion Medaille D'Or rims (didn't last long). I later converted it to a 10spd. It's lived a hard life and I repainted it several times. It's now off being professionally repaired and repainted.

I'd never heard of the Chronometro until now. It looks like it was first described in the 1974 catalog. I'm thinking the style of my Kenistons and Super Mistrel Fastback were popular at the time and Holdsworth formalized it in a specific model.