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The last double dipping of F1 drivers at a GP weekend would probably have been the wonderful BMW Procar series in 79/80. They ran BMW M1's as a one make series as a GP support category with predominantly F1 drivers of the era in the entry, in I believe just European rounds.
Even in those days sponsorship contracts shaped the field with the Procar series running on Goodyear rubber. Those F1 drivers contracted to Michelin F1 teams were precluded from taking part.
A brilliant series none the less.
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