Three Insulators From Germany

Reprinted from "INSULATORS - Crown Jewels of the Wire", December 1973, page 11

Brown tramp in center embossed:              
RG            
0450          
151        
(very faint)        

White tramp on left embossed the same, 
except Nos.  30 ? 12  
(No bottom Nos. visible)

White one on right unembossed