Obverse
順道制勝 /Jyundô-Seïsyô; Jundo Seisho/ - Following the Way Produces Victory /kanji 順 (read jun) meaning "right, order", 道 (read dou) meaning "path, teaching, way" and the word 制勝 (read seishou) meaning "victory"/
reverse
朝鮮柔道奨勵會 - Korean Judo Promotion Association
優賞 - Grand Prize
Original case
銅牌 - Bronze Medal
Watch fobs were made by Seoul-based workshop Enomoto.
榎本商店 - Enomoto Shoten
京城 - Keijō /Seoul/