 Jo Siffert heads for 3rd in Porsche 917 10 Watkins Glen Can Am 1971
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 Porsche VDO 10,000 RPM Mechanical Tachometer, Chronometric Movement: 908 917 RSR 935 (eBay Feb/2011) Photo 1
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 Porsche VDO 10,000 RPM Mechanical Tachometer, Chronometric Movement: 908 917 RSR 935 (eBay Feb/2011) Photo 2
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 Porsche VDO 10,000 RPM Mechanical Tachometer, Chronometric Movement: 908 917 RSR 935 (eBay Feb/2011) Photo 3
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 Vic Elford 917 Racing vs. Gulf/Wyer 917s "Tough race"...
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