I'm still sticking with my GS answer.
In the back of my mind I thought there might have been older campy hubs that looked like that. To be clear those are real "gran sport" hubs correct? Tipo being the all alloy with fewer large hole that came later?
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear