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Sieb Postma

3 race(s)

Series Race Date Event Track Bike Entrant Result
1954
Inter 250cc May 16 Circuit van Zandvoort Zandvoort 250 Moto-Guzzi 9th
FIM WC 250cc Jul 10 Dutch TT Assen 250 Moto-Guzzi ?
Inter 250cc Aug 7 Internationale Motorraces Tubbergen Tubbergen 250 Moto-Guzzi 2nd