This child's costume mask represents Ultraman, the superhero from a futuristic Japanese television series. The mask is made of plastic silver with transparent orange eyes, and a red mouth and ears. A fin runs down the middle of the forehead.
Ultraman was a Japanese television series that first aired in 1966, called Ultra Q at the time. The show was produced by Tokyo Broadcasting System and Tsuburaya Productions, and was broadcast on Tokyo Broadcasting System (TBS) from July 17, 1966 to April 9, 1967, with a total of 40 episodes. Comic books with the character were released in 1993 and 1994.