I thought it was a bit squiffy to start with, but I dragged out a couple of mine with labels and I have one that's not quite so flat with narrower proportions too.
H'm... I don't know now that I've had time to pnder it - it may very well be just a duff photograph with washed-out colours. But they're selling another Gulvase and the colour looks fairly spot-on with that one.
There are so many copies out there that I'd avoid any variation on eBay like the plague - even at the risk of missing out on a prototype/one-off piece. With the uncased Gulvase it's even harder to tell the fakes from the originals, even with handling them yourself. I once had one in jet black (well, very VERY dark purple), and I was convinced it was a super-rare real thing until I found a stall with two on at a nearby antique fair!

I think there was another on eBay recently - I'll see if I can find the auction.