I was reading that the pit color change over from grey to the funky blue green started sometime in 1966 for the Mig 21. I have been trying to see what color NVAF red 4326 has, Eduard is listing grey as the color including the pe set. This particular aircraft was sent to Nam in 1966 so it's very possible it was an early example having the grey pit color? I have seen online builds with pits having either colors, so which one is correct?