One of only six made, it had just two owners from new, and fetched £454250 (about R8.9million).
The Tourer was bought from its first owner Colonel Guy Bedford by war hero Charles Blackham as a non-runner in March 1952 for £260. A talented engineer, Blackham soon had it running and drove the classic convertible for 36 years.
The car then spent about 30 years locked up at his home in Manchester before being discovered after his death last year and auctioned as part of his estate.