What is the Shure model H169/U handset?
The H169/U battle announce handset was designed and manufactured by Shure for the U.S. Military. This handset was introduced circa 1965 and discontinued circa 1992. It contained a noise cancelling mic element, part 90A782 or 99A726, and an preamplifier circuit board, part 90A783.
As of December 2012, here is a replacement for the H169/U: http://www.roanwellheadsets.com/?page_id=458