Here's a rarely seen porcelain spook that is incused "RIG" (Rosenthal Insulator Factory) "30309" and "30" below that. Likely made in 1930. This unlisted German made spook measures 3 1/2 inches across the base, 5 3/4 inches tall and 4 3/8 inches wide across the top. Only a super thin fingernail glaze flake to the skirt and two tiny scuffs on wire groove.

First email gets this rare insulator for only $70 plus postage. Thanks!