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I've just checked on this and it was from Belgium 1973 that the teams had set numbers that they stuck to through the year. For 1974 the start numbers were based upon the finishing position in the Constructors championship (as it is now), but from 1975 onwards the teams kept the numbers from the previous year, except for the team with the Drivers World Champion who swapped with the existing numbers 1 & 2.
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