From Wikipedia: The Type 2 Flying Boat, developed by the Imperial Japanese Navy, first flew in 1941 (Showa 16). Its abbreviation was "H8K." It is considered a masterpiece, boasting the world's highest performance at the time for a flying boat equipped with a reciprocating engine [1]. Also known as the Type 2 Large Flying Boat, it is commonly called the "Type 2 Large Flying Boat" (Nishiki Daitei or Nishiki Taitei). This is a cup with an illustration of a flying boat on the back, inscribed with "Kawanishi Large Flying Boat Completion Commemoration," a cup used at a ceremony celebrating the first flight in 1941. How about it as a collection that captures the era? The other cup's contents are unknown, but it was stored in the same place, so it is from the same period. I will sell them together. I will sell it to those who understand that it has been stored at home.