Aluminium cover - serial No. 1118
NATO Key has preset tension settings. It was designed for use by NATO forces. Made by Pryce Edwards Ltd. and Marconi S. & R. Systems Ltd in the 1970/80's. The cover of this key is battleship grey painted brass. It weighs a hefty 3-1/2 lbs. The cover measures 8" by 3.25" (203mm by 83mm) but the keys overall length is 10.5" (268mm).
Thanks to www.9h1pi.com for info.