for the few headsets I have needed to install I was lucky enough to have a few old Campi ones on hand. I did install a Ritchey in the Basso frame I traded to TxVintage. it seemed pretty good for the price I paid.
personally unless you want a period correct or exact replacement I don't think it really matters. fit astetics and durability are what matters.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk