I think the TVK site is correct; the walnut-and-metal ones were sold in North America; the black ones elsewhere (Europe and Asia).
I believe the PF-1000 was Yamaha's best TT at the time, OUTSIDE of Japan. Domestically, they had the GT-series (GT-750, 1000, and 2000(L/X)). I have a PF-800 and a GT-2000, and while the PF-800 is an excellent TT, the GT-2000 trounces it. (You'd expect that, though, to see them side-by-side; as big as the PF-800 is, it is dwarfed by the GT, and the platters are worlds apart.) Even so, I'd still recommend a PF-800 o r its tweaked-up twin, the PF-1000, to anyone looking for a good TT, as it is already better than most TTs out there. Certainly good enough to justify the extra expense of a good LOMC cartridge. You could do worse than choosing one of these as a "lifetime keeper" TT, as it sits well up the curve of diminishing returns, and to get anything competitive in a new TT would cost more. (Yes, there are better TTs out there, but not too many and not too cheap.)
I'd like to think that the Yamaha people got a little tired of having their excellent direct-drive technology bashed in certain UK audio magazines (picked up and regurgitated in US publications), so they decided to fight back in the best way they could: they made an even BETTER suspended sub-chassis belt drive than their detractors were making, and kept the even-better DDs to themselves. Beat the other guys at their own game, and then keep the best things for yourself. What better revenge? Okay, I don't really believe they thought that, but it makes a good fantasy story!
More likely, they just saw that the market was influenced enough to make belt drives more saleable in certain markets, and thus gave the markets what they seemed to want. They applied their engineering expertise to making a good suspended-chassis belt-drive TT, came up with an innovative arm technology that actually works well, and gave us perhaps the best TT of its type (certainly one of the best). The one thing Yamaha had a harder time overcoming back then was the perception that they were a motorcycle and heavy-machinery company, and therefore not such a serious audio company. They didn't sell too many of these, and got out of hi-fi audio not too long after those days (Although they remain significant in the musical instruments market, and other, bigger factors were behind the decision.) It's ironic that they actually made some of the best audio gear out there, including these TTs!