Small Minehunters RA6-8, 1943
These "Raumboote" (or R-boot) were tasked with keeping harbors and rivers clear of mines. Many were built and some featured Voith-Schneider propulsors, but these early (?) units clearly are designed around twin propellors.
These units also differ from the general description of the Minenraumboote at German-navy.de by their outfit of 2 (rather than just 1) 37mm Flak guns.