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- Manheim, S.
Country City Amsterdam
Symbol cartouche, frame, plus +, ribbon
Shape cartouche, frame
Era early 20th century
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- Mesquita, S.G. de
Country City Amsterdam
Symbol cartouche, frame, ribbon
Shape cartouche, frame
Era early 20th century
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- Mopman, S.
Country City Den Haag
Symbol cartouche, crescent, frame, hexagon, moon
Shape cartouche, frame, hexagon
Era early 20th century
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- Skaletzky & Marcus
Country City New York NY
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- Sol-Mer Jewelry Corp.
Country City New York NY
Symbol marquise, navette
Shape marquise, navette
Era c.1950
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- Sommer & Mills Co.
Country City North Attleboro MA
Era c.1896