In 1949 Fritz Fichter opened his own watch factory Uhrenfabrik Goldbuhl Fritz Fichter KG. 27 years later, in 1976 Fichter KG closed operations and filed for bankruptcy. Chess clocks can therefore only have been produced at Fichter in the short period between 1950 and 1976.
This particular model has a date on the clockwork 1975, I assume it has been produced shortly before the bankruptcy. Very unusual design!