a friend at IWC gave me an unofficial answer
Here's more or less what he wrote --not an exact quote and please don't consider this an "official" corporate statement:
"It’s difficult to find out if any fiven Bundeswehr watch was delivered to the executives at VDO or PORSCHE DESIGN. With the case-number you might find some information in the archives for those watches were delivered to PORSCHE DESIGN in Salzburg.
"The watches were delivered to the VDO executives had the same delivering-address as those which had been delivered to the Bundeswehr. However, the watches for the VDO executives are usually without the "Bundeswehr-Number".
"But as you might know Service for the Bund-watches was not been done by IWC, since the Bundeswehr did had their own watchmakers. Moreover, I have noticed that there are a lot of marriages in the market which have been built from original parts of a Bund and parts from a civilian Ocean 2000 even with some movement-parts of ETA (not the modified IWC-parts). It is easy for some Internet-cheater to promote such a watch as "rare - especially for VDO executives".
"The only way to check if it is original is to send the watch to Schaffhausen."
Good luck,
Michael