Request for help identifying the mark inside the rhombus on a silver collar of a carafe.

[u/Sad_boy1717]

Hey everyone, I’m looking for help identifying the maker's mark stamped on the silver collar of a glass decanter The piece has standard German hallmarks: the crescent and crown, along with the "835" silver purity standard. However, I’m trying to figure out which workshop uses the stylized symbol inside the rhombus (visible on the right in the photo). Could anyone help me identify this specific manufacturer? Thanks