As far as I know, Stan Sakai has only sold one page of original Usagi Yojimbo artwork that was actually published in an issue of Usagi Yojimbo as part of a story.
1: What page from which story was sold?
2: Who was the page sold to?
3: How much was the page sold for?
One guess per question, each correct answer counts as an entry in the drawing for the winner. Please PM me your answers. Some type of random number generator will be used to select the winner......
