Radio Transmitting Key Type SE-1865

Kilbourne & Clark SE-1865 Submarine Spark Key.was a 1/2 KW key with an auxiliary contact for use with the TM Type submarine set. 

(Probably a reference to the Navy TM Type station as used in submarines. They were made in the 1917 to 1925 timeframe and emitted 100 watts. These transmitters were originally spark transmitters and were modified into alternating current tube transmitters. This info from Howeth's "History of Communications-Electronics in the United States Navy", Appendix M, page 593.) 

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