Sale or Barter For sale - Circa 1956 oversized signed portrait of Chiang Kai-shek gifted to a diplomat in the 50's

Goods for sale, barter, or open to offers.
My wife's great grandfather was one of Chiang Kai-shek's teachers.
That's actually really cool!
Does she have any of his work with his signature 😆 it's become very valuable, big market, relatively little supply