Continental Rubber R4 Insulator's ~ Different Embossings

By Andy Schoenleben; posted May 24, 2017

View Original (3072 x 2304) 2297KB


I have two Continental Rubber R4 Insulators. One is embossed "PAT. PEND" and the other is embossed "PAT. 2.218,497."

Is one more rare than the other? Is one more valuable than the other?