@geoff: thank you, it is my bike, I've cutted the steerer and now the seatpost and the stem are thomson (black).
@andrewl: I think that the '97 king kahuna was available with different colors of decals, I've shown the picture to Kona people and they have confirmed me that this is one of the earlier '97 frames (serial n° is 030), perhaps they have used '96 decals, I don't know.