東洋化成 (Toyokasei) is a manufacturer and a pressing plant in Japan.
The company was incorporated in Yokohama in 1959, and started producing materials for SP and printing services.
In 1961 they began producing materials for LPs, then in 1966 started the mastering of contents, cutting and metalising. In 2004 they opened the sales office in Aoyama, Tokyo.
Known matrix info:
Some releases have an "X" stamped into the runouts, which comes from the father stamper. Only add "Mastered By" credits for releases with the "X" marking if they are otherwise credited to have been mastered or pressed at Toyokasei on the release itself.
