I just got this Czech Army Morse Key, over 50 years old but still in original unopened packaging. First thing was to remove the 2 pin plug and fit a 3.5mm mono jack plug.
I kept the two pin, might come in handy for something.
It is really nice to use, i adjusted it to suit me, small gap and low tension on the spring and it a joy to use. One of the nicest straight keys i have used in a long time.
I also got this nice old Cossor scope, it works but just needs a “service” it was made in 1952.
ideal i think to use with the octopus tester. It is very small, only about 5x4 by 12 inches long.