Karl Kaltenbach Founded 1870 Altensteig Germany Otto Kaltenbach Founded 1921 Altensteig Germany Keystone Silver Co. Founded 1914 Philadelphia, PA USA King Edward Silver Probably a trademark of the National Silver Co. USA Kleinwort & Peerless founded c.1895 Alfred F. Kleinwort & Percy W. Peerless London England, UK

Knickerbocker Silver Co. Founded c.1900 Port Jervis, NY USA Koltchuginski Savod Soviet Period Russia Kronheimer & Oldenbusch Co. c.1900 - 1942 New York, NY USA Arthur Krupp c.1900 - c.1950 Berndorf, Austria Esslingen, Germany Milan, Italy

Thanks to forum member "Patrick" for providing information and many of the trademark illustrations.
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