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Alpina headset?
Depends more on the frame than the headset. Also, Alpina seem to have offered different sizes of integrated headset over the years. Aluminium Dolans with 41.8mm (Campag/Italian) integrated bearings probably need a 47mm cover. You can measure across the top of the bare headtube with sufficient accuracy to choose a cover with the rule out of your school geometry set.
Anyone had one made for an Alpina headset? #novernier