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wrt investigating the kitting -

fittings have date codes which can be checked to see how close to each other they may be

it may have come new all or mostly Campag NR

chainset likely a replacement to accommodate rider's gear requirements

possible that fitter of chainset reused existing Campag bb cups

regarding Superbe brakeset -

it was quite common at this time for new Campag NR kitted machines to come through with something other than Campag brakes - the cost differential between Universal/Weinmann/MAFAC and Campag was LARGE

sometimes owners of such machines wanted to upgrade brakes but balked at cost of Campag and would fit Superbe or DuraAce as a more affordable alternative

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