I would say this ring is a bad made fantasy item with a lot of faults.
In my opinion there are no originals of this pattern for compareing, only a few of exact this rings, produced and sold years ago.
Be sure, a period ring with swas and german colors is very well made in relativly high quality.
They had starting may 33 even a law for protecting the national symbols.
I am german ring collector for long years and i have some patriotic rings - all very well made.
From this pattern i have never seen a period advert or pic, or know one from a sure source.
Believe it or not - this ring is for sure no period made item. Sorry!