Back in the early days of the forum --2001 and 2002-- there was a fairly energetic discussion about the Mark 11 --back then, every IWC vintage collector's "perfect watch". A question arose regarding the authenticity of Mark 11s with white dials.
I wrote an article which was introduced by the following forum discussion.. The article itself can be accessed directly by clicking here. Note that several vintage experts weighed in on the discussion --Thomas Koenig, Ralph Ehrismann and the late EarlyIWC (Friedrich Wagener). I consider them all true experts, and Fritz (Friedrich) was especially a great IWC vintage scholar.
My personal opinion, today, is that all the white dials were put on later, not by the military, in the case of the IWC Mark 11. I also would add that I talked to James Dowling, a well-known UK watch expert, who expressed some doubt about Maurice's credibility.