Hi Michael, my feeling is that it's probably no later than 1920s, possibly Czech / Bohemian... I'd be looking at makers like Josephinenhutte, Umann, Bruder Feix or Bruder Rachmann initially, but I'd not want to point a finger at any and say for sure without finding catalogue evidence.
I've been through all my ref stuff this afternoon and can't find this set - it's quite a distinctive design, so should have jumped out.
I assume there are no clues on the glass or any marks on the metal part?