I have 2 original Scorpions I built as kits. Both have the diamond-airfoil fin units used in the Challenger-1 and Kadet. What is really weird about the two is one has the Orange-colored units of the Challenger-1 and the other has the Black-color-molded Kadet units. I do know I built the one with the orange fin units first. May have been early production using orange that switched to black later in the run.

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