Scarce gilt and white enamel badge from the 53rd International Olympic Committee session held in Sofia, Bulgaria, in 1957, measuring 23 mm in diameter and 58 mm tall, featuring the city's coat of arms at center, encircled by the test: "53eme Session CIO, Sofia." Only 36 IOC members attended the session, during which a volleyball demonstration tournament was played. As a result, the IOC members decided to include volleyball on the program for the Games celebrating the XVII Olympiad in Tokyo, 1964.
