Serge,
,the red show casting defects....
There used to be 2 SA rings here,,probably still are somewhere just have to find them.. I've been collecting for over 30 years and only have 1 [not the same pattern as yours anyway]. Unfortunately I can not get to any of my rings presently.
Maybe someone here will show theirs. Remember,,most of our rings we collect were pre war and early war. After the Rohm purge the SA fell out of favor and you don't even see the rings advertised.
They are very rare period!
Here is a early advert for one..
