Here's a very cool ashtray advertisement for Rosenthal High Voltage insulators. Has an original photo showing previously unknown multipart insulators in service. On the reverse, it has a historical listing of various high voltage lines using Rosenthal insulators [id=331746269]. Easily VNM+ condition with only light glaze scratches.

First email gets this rare advertisement ashtray reduced to $140 and postage paid by me. (Temporarily misplaced this item) Thanks!