Running 700x 20 tyres.
That's really nice, and a proper hairy-chested freewheel
Noticed that, not for the faint hearted that cassette
At a guess I'd say that was built for time trials. A straight through block was the norm in the days when a hump back Bridge was enough to have a course described as "Sporting".Maybe that's why old-school racers would sometimes fill their bidons with somewhat stronger liquor than water? To dull the knee pain when really going for it.