Gibson did indeed do custom colours, on a special-order basis. I have seen images of a special-order white EB2, EB3 etc. These were not listed as such on the released shipping figures, so nobody knows exactly how many there were. Although they are certainly not common. It is often the case that sellers will imply a custom colour (which increases value) rather than admit a refin (which reduces value)
The way I understand it, the Epiphone brand existed to avoid the dealer licences and to be able to sell single instruments at a slightly higher price than the Gibson stuff (I think the Epiphone Rivoli cost $30 or so more than the Gibson EB-2)
yes, there were limits to how many Gibson stockists they would have in an area, they could increase this by having Epiphone stockists too. Prices were sometimes a little higher, sometimes lower, sometimes the same as equivalent Gibson models, but differences were typically small.
So if anyone ordered a custom instrument from the Kalamazoo factory (if that was even possible in those days), wouldn't it be more logical that it would be branded Gibson instead of Epiphone?
I think you could get either. Some players who had an affinity for Epiphone jazz guitars, for example may have preferred an Epi. But, I can not recall any custom coloured Epiphone off hand.
We are talking about this one?
Epiphone Rivoli As it happens, that was 5 minutes from my house, so I went to have a look.
Unfortunately, I can tell you this is neither a custom colour (look how much paint spray got on the label) nor an original two-pickup. It would originally have been a regular one-pickup Sunburst Epiphone Rivoli.
I noted that two pots are dated 1960, two are new. The tone-choke button was replaced for a three-way switch. So it is one hole short on the front if you want to put the tone-choke button back in. The choke itself is still there under the bridge though.
It does look good in black, and the refin has been well done. With two pickups would make a great player, too. I quite fancied this myself: it will certainly look good on stage, and I hope you can find all the parts to resurrect this bass. It's certainly worth doing, and playing out.