Benten,,,your WestWall ring 'mit Kanone' is an old classic.
In the 1970s this pattern was very common, but by todays standards its a rare ring and in good condition,,really, a beautifully styled ring. I've seen 2 type of 'coloring',,one is a flat/mat finish silver wash type,,and the more common flash plating ,almost like a chrome.

Odal, thats another old classic. I've seen it many times but never owned one. That too also came with a silver wash at one time. A simple yet cool looking ring!

You both made two good catchs!