Should the "gesichert" lettering on Mauser military lugersbe painted?

[Chichaco98]

I have seen examples both ways, painted and unpainted. I pose the question after reading some things on one of the P.38 forums. There is a consensus there that if the "F" and "S" near the safety are not painted red and white respectively, one should be suspicious the pistol has been refinished (dipped).