Sankyo Seiki (listed as Sankyo Precision Equipment Company, Ltd./Sankyo Seiki Kabushikigaisha) is a Tokyo-based Japanese manufacturer that produced electromechanical arcade and pinball equipment in the 1970s and is best known in pinball circles for the rare baseball-themed machine The World Series (1976). The World Series is a one-player EM baseball pinball featuring two flippers, eight gobble holes, three kick-out holes, left and right dual outlanes, a playfield animation unit that advances a runner around the bases, and simple bell sound effects—details, photos and a Japanese service manual with schematics are archived online for collectors and restorers. Only a handful of examples are known (the Japan Pinball Museum reports just two), making Sankyo Seiki machines exceptionally rare and sought-after by vintage pinball collectors and enthusiasts of Japanese electro-mechanical pinball history.