I still have a LM-14: working and accurate.

The LM-14 manual dates from 1943, and as the LM-8 came earlier, could it be 1942 ?

73, Jacques, VE2JFE in Montreal

I keep a gifted LM-8 (a Navy version of the BC-221) on my workbench as a frequency generator.  Extremely accurate.  Nearly 80 years old, I think but I can't find the production date.  I also have a nice BC-221 and a third unit (Army version) awaiting restoration.  I really like these old units.

W4NPN