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- Jongeneel, M.
Country City Gouda
Symbol cartouche, frame, hexagon
Shape cartouche, frame, hexagon
Era early 20th century
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- Macpherson Jewelry Co.
Country City Providence RI
Symbol cartouche, circle, frame, shape
Shape cartouche, circle, frame, shape
Era c.1915
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- Mason Jewelry Co., C. H.
Country City Providence RI
Era c.1922
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- Mehrlust, J.
Country City New York NY
Symbol laurel, ribbon, wreath
Era c.1934 c.1950, c.1943
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- Metro Creative Jewelers
Country City Los Angeles CA
Symbol cat
Era c.1950
