QT over-glaze marking on a Thomas M-2926

By Jeff Markwart; posted October 2, 2007

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Here is the seldom seen orange over-glaze marking used by Thomas to denote their Quiet Type (QT) RFI treatment. According to Jack Tod's Porcelain Insulators, the marking was applied after glaze dipping and before firing. The marking shown is on an M-2926.

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