Here's a rarely offered or seen white porcelain "frog eye" cable top, German, incuse marked 641 (followed by indecipherable number) also marked with stylized B (could be marking for Bergstad and nothing like OB marking). Similar to Westinghouse piece found in robins egg blue but thicker and heavier ceramic material. 3 x 3.25" Mint condition.

Reduced to only $30 plus postage. First email gets this tough piece.