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- Macomber Mfg. Co.
Country City Providence RI
Symbol heart
Shape heart
Era c.1915
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- Macpherson Jewelry Co.
Country City Providence RI
Symbol cartouche, circle, frame, shape
Shape cartouche, circle, frame, shape
Era c.1915
-
- Macpherson-Roubaud Co.
Country City Providence RI
Symbol cartouche, diamond, frame, lozenge, rhombus
Shape cartouche, diamond, frame, lozenge, rhombus
Era c.1915
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- Mader & Fröschl
Country Era 1867-1922
Symbol cartouche, frame, rectangle
Shape cartouche, frame, rectangle
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- Mader, Leopold
Country Era 1867-1922
Symbol cartouche, frame, rectangle
Shape cartouche, frame, rectangle
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- Maderak, Adalbert
Country Era 1867-1922
Symbol cartouche, frame, rectangle, v clipped
Shape cartouche, frame, rectangle, v clipped
-
- Madier & Milenko
Country City New York NY
Symbol cartouche, circle, frame
Shape cartouche, circle, frame
Era c.1934, c.1943
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- Madry, Franz
Country Era 1867-1922
Symbol cartouche, dot ., frame, oval
Shape cartouche, frame, oval
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- Magid, Samuel M.
Country City Providence RI
Symbol circle, oval, ring
Shape circle, oval
Era c.1915
-
- Magnussen, Erik
Country Era (1884-1961) e.1901
Symbol zigzag
-
- Magnussen, Harro
Country Era (1861-1908)
-
- Mahatschek, Karl
Country Era 1867-1922
Symbol cartouche, frame, oval
Shape cartouche, frame, oval
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- Main Jewelry Co.
Country City New York NY
Symbol cartouche, diamond, frame, lozenge, rhombus
Shape cartouche, diamond, frame, lozenge, rhombus
Era c.1922, c.1934
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- Mainar, Montserrat
Country City Barcelona
Era (1928- )
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- Maintien Bros. Inc.
Country City North Attleboro MA
Era c.1915, c.1934
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- Maison G. Desbazeille
Country City Paris
Era e.1877
