- Hurd, Lee M. (Lee Maidment) 1873-19451
- J.B. Daniel1
- J.E. Limeburner Company, Philadelphia, Pennsylvania1
- John Blackburn, London1
- John Ewan, Silversmith1
- John Reynders & Company, New York/Chicago1
- John Wyeth & Brother, Philadelphia, Pennsylvania1
- Johnson Bros, England1
- Johnson and Lund, Philadelphia and Chicago1
- Josten1
- Kays Caps Inc. Green Island, NY1
- Kny-Scheerer Company, New York1
- Kouwenhoven, William B., M.D.1
- Kredel, Frederick E. (1903-1961)1
- L.D. Caulk Company, Philadelphia1
- Lamberton Scammell, China1
- Lentz & Sons1
- Leonard, C. Henri (Charles Henri) 1850-?1
- Lucae, Johann Constantin August 1835-19111
- Lundborg1