Danish Modernist Silver Ring Mystery Unkown Maker

Hello, I have a silver & enamel ring that is marked with hallmarks I’m unable to identify. Anyone know what these marks mean? It’s marked “Denmark” but the others, I can’t make out. I assume they’re the maker’s hallmarks.

 

Without either the word sterling or a numeric fineness indication, I am curious about the almost round (octagonal?) mark and what is inside the shape. From 1939 until 1977, the usual mark for solid silver items in Denmark is the "3 towers" mark shown on this page. https://www.925-1000.com/dm_Assay.html In theory it should be accompanied by the Assay Master's mark (which does not resemble anything else you have shown in your pictures.) Can you get a better look at that?

 

Also A-Aron, if you have a chance, go back and edit your photos to full image. Thanks.

 

Most 50s-60s Danish Modernist jewellery I have seen doesn't have the official marks. (Maybe because it was below a certain weight?) This is a Borresen & Lassen mark from the 50s-60s (not mine):


Here is a list of Danish silversmiths, sadly no actual marks, just names and initials:
https://www.925-1000.com/denmarkB.html