Porcelain Exchange Madness! nine different versions

By Bob Berry; posted January 10, 2021

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Here is a cool set of nine different double groove "exchange" style insulators -- take them all for $35 plus actual postage

U-47 (dome embossed) FEDCO

U-73 no markings (Pittsburg)

U-52 no markings, carved top (Thomas) -- discoloration of some of the glaze

U-57 (center embossed) MACOMB

U-1192 (base embossed) STROMBERG CARLSON // MADE IN CANADA

U-48 no markings -- small flat base chip

U-47 (dome embossed) P.P. INC.

U-57 (center embossed) MACOMB -- extra tall version!

U-52 no markings, carved top (Thomas)