SS skull by Deschler & Sohn "M1/52". Cupal construction with soldered on prongs. Maker marked on the reverse with the RZM mark and logo "M1/52" of Deschler. Fantastic condition with small signs of age. Both prongs untouched!! No repairs, no damage. 

Very long time ago I had such a perfect skull. Prongs are in open position, easier to fit the visor. RARE!!