Tough to crack; Car Puzzle nr. 40

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Here's a fine mid fifties sportscar with everything you may wish for. Daring design. Purposebuilt cockpit. DOHC twhin SU engine. And much more. Still, many of you possibly have never seen the car before. The engine however bears a famous name, but sorry, we took the name out in order not to spoil the quiz... Further intersting to know is that the manufacturer is a lady. She built cars meant to race, even for Le Mans. Too bad the make came in very nimble numbers and was so short lived . 

Tell us in the most efficient way what you know  about this cars identity, yet be sure not to use more than 100 words. Use the commenting box below and do so before Monday, July 16.  The more accurate and original the knowledge that you display, the bigger the chance that you are the one to win the PostWarClassic T-shirt. 

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