The James Knights Co.
Sandwich, IL

Manufacturer of crystal-controlled oscillators for military and other applications.  Used the label "JK".

The James Knights Company of Sandwich, Illinois was founded in 1942 to develop and manufacture crystal-controlled oscillators. In creating the company, James Knights and Leon Faber were responding to the enormous demand for frequency control in military radio and telephone communications during World War II. Faber, a utility company employee, had previous experience making quartz crystal control units for amateur radio enthusiasts.  James Knights owned a local electrical supply store.

After the war James Knights produced crystal units for military aircraft radios. The firm became a subsidiary of CTS (Chicago Telephone Supply) in 1964 and the company name changed to CTS Knights. In addition to supplying crystals for use in military applications, the company manufactured crystal oscillators for use in a variety of other electronic devices including computers. During the early 1970s, the company was interested in the use of crystals in watches and clocks. 

The company continued to produce crystal units as a division of CTS, now a global electronics firm, until 2002 when it was shut down. (Ref: Smithsonian Institution, Online Virtual Archives)