I have an old german wwII ring and would like some information on who it belong

Question:

I have an old german wwII ring and would like some information on who it belonged to.?

this ring is silver,it has an eagle on both sides,a swastika being carried by another eagle,on back it has"RZ" and the number300. On front it has"Meine Chreheiktcreve".

Best Answer - Chosen by Asker: I'm REALLY sure that that mysterious word "Chreheiktcreve"
should really be "(Meine) Ehre hei㟴 Treue", an SS slogan - which brings me to the ring.I could not identify it, but it might be an "SS Polizei Ring".