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Richard,
F1R show a few chassis numbers in 1971 and 1972
They show Bev Bond in -10 at Oulton Park on 20/8/71 and Spiztley in -11 at Mallory Park on 29/5/72.
This would imply that Hurst's and MacDonald's cars were two of the first 9, resold.
I have a vague memory that Spitzley later (73-74) raced a 713M updated to 733 spec, with a chassis number 713M-7.
matbe he sold his own 713Min 72 and bought an updated one for 73 F3?
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