ship identification (foto)

[offshore]

Any idea what ship is this?For sure picture taken after 1935,(perhaps 1940 ) as the town's name changed from Rügenwaldermünde to  Rügenwalde- Bad after Hitler's reform in 1935 .
_{http://www.technikanurkowania.pl/forum/gallery2/d/25629-1/wojak.jpg}

[kgvm]

OB = "Otto Braun", 1938 ex "M 129", 1940 --> "M 529".
So taken very probably either 1938 or 1939, for I assume the letters were deleted after August 1939.