unless campy still dates the locknuts, you should check and let us know. I have a set of chorus hubs circa 2000 or 2001 and they are decidedly more modern than those. So I would guess they pre-date 2000.
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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