Klaus-Michael Schneider saw this table flag in a Hamburg St. Pauli pub on 28 May 2004: white over red, with a grey masonry gate, open doorway, eight windows and triangular roof. He estimated it at about sixty years old and questioned the stone-grey shade. Nüsse doubted a shipping identity and suggested a municipal flag; neither suggestion is confirmed.
Keep the explicit scope label independent; no alias or company identity is inferred.