KRUPP SEESCHIFFAHRT GMBH.

Brown 1926 shows a red-white-red flag with bands about 1:5:1 and three black rings on the white. The livery commentary calls them intertwined, unlike the corporate trademark account’s explicit description of superimposed rings. Its 1926 publication establishes use before 1930; later sources resume after the war.

The post-war ring flag is recorded in US Navy 1961 and Brown 1995 and by Nüsse’s table flag. Herkules VI confirms the K121 funnel, with a slight variation associated with its inland-vessel form.