Interestingly my GMT 2446c has a white second hand. Just came back from a full Heuer service where they replaced the hands, crystal, bezel and 'improved' the luminous markers. I asked them to ensure it was returned to original and they insisted the white seconds hand was correct. Seems originally they used left over stock from the previous model before moving on to the red seconds hands.

Not an issue but just an update to the forum records!

Regards

Pedant