Exceptional pumpkin variants

Five or six years ago, I happened upon a pumpkin in the bin at a Whole Foods in Cambridge, MA, that turned out to be substantially different from the others I've had. It was, I think, about eight pounds. Its skin was milky white with very faint, thin green veins, and its flesh had a distinct reddish tone to its orange color, very different from the usual pale or medium orange of a pie pumpkin. After baking and pureeing it, the resulting mash was unusually dark and dense and the pie I made out of it was fantastically rich and flavorful.

I have no idea what kind of pumpkin this was. I suspect that the store was using it only for decoration, or to be sold as a decorative pumpkin, because it was in no way advertised as a pie pumpkin (it was way better than any pie pumpkin I've had) and the employees weren't even sure how to ring it up. Other white pumpkins I've bought that I thought were the same turned out to be no different from similar-looking orange pumpkins.

Was I the lucky beneficiary of a unique gourd or is there a particular pumpkin species or cultivar that displays these properties, and if the latter, what is it and where can I get more?