So on New Years I pulled his book off the shelf and reacquainted my self with his stamps. Donald not only painted the stamps, but created the countries for the stamps. The countries had their own history, currency, exports. The cancellation stamps are carved from rubber erasers. More about his short life can be found Wikipedia.
Above two images Artnet
Above three images from Stephen Springer Davis.
Donald had been a stamp collector since age 6. By the age of 10 he started designing his own stamps for imaginary countries. Years later when he went back to his art he continued where he left off as a child. His knowledge of stamp collecting enabled him to create philatelic correct stamps.