The website flag logo appears to show an anchor and cable, but Rosanoski could not establish whether the anchor is fouled or plain.
W477 is a yellow flag with narrow red horizontal edges and a central upright blue fouled anchor. António Martins-Tuválkin’s FOTW image has proportions 2:3.
At Potsdam, Weiße Flotte passenger ships and restored Havel Dampfschiffahrt steamers operated circular trips.
Germany, Potsdam.
Keep the explicit scope label independent; no alias or company identity is inferred.