Vintage unusual Vintage Torero Redlines best Hot Wheel, two tone red colors, Mattel USA

This vintage Redlines Hot Wheels has an unusual aspect, the rear of the car is a deeper red color than the rest of the body, appears to be red or magenta. Torero Redline is not rare but I have read about mistakes like this being made in production but they don't usually make it past the quality assurance best program. I don't believe this is a mistake just toning. USA made part of the second series of Redlines that were then very popular selling 7 times the amount expected.