waterproof rein coat opinion needed

[pereto]

Felow Collectors,
An strange Item came to me... It looks ordinary 80-ties years old reincoat ..but I was surprised by garmet's buttons. One was Criegsmarine, other 6 was Wermacht style (not sure if they are not postwar?) with marking "W"or "M" in rhombus. I can not understand what are they doing on this item??? Is it Bundesmarine or Bundespolis? Any Ideas?

[reneblacky]

Looks to me to be a DDR navy jacket, buttons have been replaced. The clue for me is the 80's type NVA collar buttons.