The curio-dealer sold the gourd to a wealthy _______.

In the story 'The Artist' by Shiga Naoya, the teacher confiscates Seibei’s gourd and gives it to the porter; the porter later sells it to a curio-dealer for a small sum (about 50 yen), and the curio-dealer in turn sells the same gourd to a wealthy collector for 600 yen. Thus, the correct buyer is a wealthy collector.