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- Littleford, George
Country City Cincinnati OH
Era c.1915
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- Locke, Elizabeth
Country City New York NY
Era e.1988
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- Louis & Taylor Co.
Country City Boston MA
Era c.1915
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- Lyons Co. Inc., C.D.
Country City Mansfield MA
Symbol animal, lion
Era c.1915
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- Marks, Gilbert
Country City London
Symbol cartouche, frame, octagon
Shape cartouche, frame, octagon
Era (1861-1905) e.1885
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- Marschall, Rudolf Ferdinand
Country City Vienna
Era (1873-1967)
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- Mazer & Co. Inc., Joseph J.
Country City New York NY
Symbol cartouche, ellipse, frame, triangle
Shape cartouche, ellipse, frame, triangle
Era c.1950
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- Morris, Mann & Reilly
Country City Chicago IL
Symbol heart
Shape heart
Era c.1915, c.1922, c.1934
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- Napier Co.
Country City Meriden CT
Symbol cartouche, frame, hexagon, laurel, oval, shield, wreath
Shape cartouche, frame, hexagon, oval, shield
Era c.1922, c.1934, c.1950, c.1943
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- Newlyn Industrial Class
Country Era 1890-1939
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- Nilsson, Wiwen
Country City Lund
Era (1897-1974)
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- Paloma Picasso
Country City Paris
Era (1949- )
-
- Parco Mfg. Inc.
Country City Providence RI
Symbol cartouche, frame, square
Shape cartouche, frame, square
Era c.1950
-
- Pearce, Henry
Country City Montreal QC
Symbol hat, man, people
Era c.1896, c.1915
-
- Philips Mfg. Co.
Country City Brooklyn NY
Era c.1950
-
- Piña, Isidro Garcia
Country City Taxco
Symbol circle
Shape circle
Era e.1943 closed 1986