Here are two tough porcelain insulators from Germany as follows -- actual postage additional.

Large strain with the German logo for AEG (Allgemeine Elektricitäts-Gesellschaft AG) ink stamped in good condition. $6.00

U-1813 style found in Norway but made in Germany -- Ear top incuse marked SCHOMBURG 1914 in good condition - very cool insulator -- $25.00