What is "ginrin"

Ginrin (or Silver Ring 銀輪) is Toshio Matsumoto's first film. He made it in 1955 as an English language PR film, although "a relatively avant-garde" one. The film score was the first by Toru Takemitsu. It was believed lost for many years; however a copy has been recently found. It is believed that a DVD of this film is forthcoming.