Spange for the Iron Cross 2nd Class. Alois Rettenmaier?

Spange is in nice overall condition with some frosting, taken on patina, to the lower date box and swastika background. The eagle has some nice tone finish with the high points having a certain amount of wear, check the lower claws and burnished swastika, dates and date box outer. The back has all four fixing prongs with the back design taking on some dark patina. This example is unmarked but from what i can see it does correspond to the Spange's manufactured by the Rettenmaier firm but i cannot be 100% sure so please do your research before purchasing.