He's dreaming. A few years ago someone put up a web page claiming only 26 of these were ever made, 13 in each color. it's utter bullshit but it's become an internet "fact." There were hundreds made, they're not rare at all. They were lower priced than an EB-0, apparently paint grade mahogany, and had cheaper tuners. There's no way they should go for more than a regular EB-0. But recently I've seen a couple on eBay repeatedly in the 1800-2200 range, no bidders. Even that's crazy. But 3500? Ridiculous.
And it's not even custom color! Pelham blue and burgundy were the standard (and only) colors offered on the MM bass.