Frankoma 5GS saucer glazed black with turquoise interior

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5GS saucer, black glaze with turquoise interior. Note the small oval "o" Frankoma mark on the base. It is fully glazed which is unusual. I have seen this only on dinnerware glazed black, prairie green and red bud. I originally thought the glazed mark was from the early 1940's but this piece and the red bud piece tell me it is from the late 1940's near the end of the usage for this mark.