50 KHz, single channel pulse code modulation  voice security equipment for use over a "N" carrier channel.

The quantities shown below were  issued to the following services for service trails as authorized in a former SECRET document dated June 15, 1955.

US Army - 4
USN - 4
USAF - 4
NSA -  23
COMSEC - 2
COM 6

Unit cost in 1955 - $ 18,500

Does anyone have any further information on this device?

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Contributors or Credits:

1)  https://www.nsa.gov/public_info/_files/friedmanDocuments/ReportsandResearchNotes/
FOLDER_065/41701139074046.pdf

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Sept 21/15