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There was discussion awhile back as to when the Yenko "shield" logo was created... the back of this photo reads "Daytona 67". Note the Yenko logo on the side of the car.
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This photo was most likely taken during the Daytona ARRC runoffs which occured November 22-26, 1967. The ARRC events at Daytona ran in the opposite direction of Nascar and Daytona 24hr events and this car is pointed "backwards" on pit lane. Also, Walt Tormohlen is listed as competing at the Daytona ARRC event in '67 in the D/Sports racer class, which this car is. Anyway, I don't believe the Yenko shield appeared early enough to be used on a '67 model year car and this race car doesn't change my thoughts on that.
-Jon