The engine was made by Christiansen & Meyer, Harburg, Germany.

[1] Oscar Neynaber was built as yard number 241 by Schiffsbau Gesellschaft Unterweser AG, Unterweser-Lehe, Germany for the Kohlenbert & Putz Seefischerei AG, Wesermünde.

The fishing boat registration PG 390 was allocated,[3] as were the Code Letters KRVS.

[4] On 17 September 1939, she was requisitioned by the Kriegsmarine for use as a vorpostenboot, She was allocated to 3 Vorpostenflotille, serving as V 308 Oscar Neynaber.

[3] On 23 September 1941, she was torpedoed and sunk by the Soviet Navy motor torpedo boat TKA-12 off the Porkkala Lighthouse, Finland with the loss of ten of her crew.