The engine was built by Klöckner-Humboldt-Deutz AG, Köln, Germany.

[2] Almuth was built as yard number 108 by Schulte & Bruns, Emden, Germany.

She was allocated the Code Letters DGKF,[1] and the fishing boat registration AE 79.

[3] On 9 October 1939, Jupiter was requisitioned by the Kriegsmarine, serving with 14 Minensuchflotille as the minesweeper M 1404.

On 22 March 1942, she was reallocated to 44 Minensuchflotille and her pennant number was changed to M 4415.