Siemens MSC-2001
The MSC-2001 is a voice encryption unit manufactured by Siemens. It works in conjunction with the AN/PRC 77 radio and it can store up to eight keys, any of which can be selected from a front panel rotary switch.  There is also a position for sending in the clear as well as being able to erase all keys.
(Photo and copy by:  Jose Ramon Soler <> )
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Nov 18/03