You know, I keep thinking about the fact that the Hero Skywalker ROTJ hilt was one of the few created in-house, in the US, vs. in the UK.
This being the case, the ILM workshop was well known to have made great use of Humbrol brand paints.
I feel pretty confident that the paint on the neck of the hilt may well be of Humbrol origin.
Humbrol Enamel Paints - Paints - Shop : Metallic
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You may be on to something, though Humbrol seems to name their paints strangely. It would actually be one of these two colors that better match the neck:
Humbrol "Gold Metallic":
Humbrol "Brass Metallic":
In any other universe, "gold" is more orange than "brass", but this seems to be reversed with Humbrol. The "brass" on the bottom is probably closer to the orange-ish color of the neck. We'd need to have a sample in-hand to verify that the 54 "Brass" color is actually the better/closest one.
Also, the texture of the paint on the neck is not super-smooth. I would suspect that this paint could be sponged on and look great. That would also mean that overseas buyers could use this without worrying about shipper an aerosol spray can.
Great find!