650A, also known as 26 x 1 3/8, and
properly known as EA3, is actually a popular size of wheel / tire in Japan. In Japan, I am told, you can get 650A tires just as nice as any 650B tires. I have seen them on eBay more than once. I also once found an internet seller who stocked them. I think they were in Malaysia.
I'll look for links... but... for now, that's all I can tell you.
Edit:
**********???? 650A
Grand Bois 'Renard' tire. Haven't ridden them, but if it's Grand Bois, well, you know.