Modern 1960s silver mark SK or S and arrow

[Spennemann]

I have a 1960s silver ring with amber, which is either German or Danish. It has the 835 purity stamp as well as a mark that is either SK with an arch over it, or an imcomplete shield with KS or arrow with an S. Any help in identifying the maker would be much appreciated.
Cheers from Australia
DS

[Bahner]

Hello, that is actually 'GK' within an oval frame. The lower part of the frame seems to be missing here. Maker is G. Kramer, active ca. 1930-1960. Before 1945 he had his workshop in the villlage of Ribnitz, after 1945 in Travemuende. Best wishes, Bahner