As mentioned by @al-onestare here is my '96 Ku, although it is blue lightning rather than flames! I am almost certain that it is the original paint from the factory. Where there is a bit of damage to the paint there is no sign of any other colours below, and the decals are an exact match with other '96 frames I have compared it to. It is really cool paint, at the head tube it is almost like a boling, grey cloud, and the lightning bolts somehow manage to go both under and over the decals! Unfortunately, the paint is not in the best condition over the rest of the frame, with a few bad touch ups, but there is no way that it is going. It also appears to be crack free (for now, scared to attempt to put a headset in!). S/N is K09606008 which hopefully comes through in the picture, and it is an 18" frame.
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What a frame, what a colour scheme. It's no Klein but it must have been an influence. I've never seen any Kona of this era with a paint-job like this, a true one-off (for now at least). Wise to keep it as a wall-hanger, like you I fear it'd start shaking if you approached it with a bottom bracket or headset
K09606008 18" 1996 cable routing, 199 decals - Black/blue/purple with white lightening - welded '96 June number 8, (@murphy79 )