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Mark B80a: Blue decoration mark, 1920-1934
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Mark B80b: Green porcelain mark, 1920-1934
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Mark B80c: Green porcelain mark ?-1979-?
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Mark B80d: Black decoration mark after 1953
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Mark B80e: Georges Boyer decoration mark 1934-c1953
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Mark x039: Uncertain. According to one source, Georges Boyer used this name around 1934.
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