"The techs discovered that German locks were particularly difficult" - Robert Wallace, H. Keith Melton w. Henry R. Schlesinger, Spycraft: The secret history of the CIA's spytechs from communism to Al-Qaeda (New York: Dutton, 2008), p. 210
wasn't able to find anything on that site (thanks btw!) but I shimmed it apart, and it wasn't terribly exciting. 5 pin lock, 3 spools, ball bearings in the springs.
The only thing unusual was two pins on the sides of the plug, which after careful consideration must be meant to restrict keys with from turning the lock cw, or ccw depending on the profile of the key.
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