PAROBRODARSKO PREDUZECE N. A. DUBOKOVIC.

Isaiæ shows a blue-over-red bicolour with intertwined white NAD initials for the interwar period. The family did not recall this flag, but remembered similar cyphers as metal ornaments on steamship funnels. Heimer suggests it might have been used in Yugoslavia when the Croatian tricolour was discouraged, but also allows that it may never have been used.

Family documentation and recollection instead identify the Croatian tricolour as the house flag. A ceremonial version added the family arms in the canton for festivities and important visitors; it is preserved in the family archives in Jelsa.