I was surprised to read in WIKI that nobody is sure of the bloodline. A genetic mutation...but an upper deck grand slam of a breed.
They look enough like my Birman, PV, (RIP) that they could be descendants of his littermates. We had him neutered before we knew he was one of 200 in the US, and we mourned the fact that we had none of his offspring.
I still miss that ol’ geezer! He was such an absolute love, and such a smartie! *sigh* I would still have a descendant if I had known...
His hair never matted. I don’t know how that worked but he was a real low-maintenance critter. He weighed 22 pounds!