Thanks.
These two torpedo boat tenders were laid down in Netherlands as Polish reefers "Lewant II" and "Lewant III". The Germans captured the unfinished vessels in docks in 1940 and in 1942 the construction was continued on a new project.
"Gustav Nachtigal" was launched in May 1944 and a month later got sunk by a British torpedo bomber.
"Hermann von Wissmann" was launched in December 1943, survived the war, and was taken over by Great Britain as "Royal Herald". In 1950 she was transferred to Belgium as the training ship A957 "Kamina".