Originally located on a postcard on this page, a flag quartered per saltire, green above, red below, and white to the hoist and fly.
Bulgarian Steam Navigation Co. Full name was Société Commerciale Bulgare de Navigation à Vapeur, formed 1892 and based in Varna. The flag is shown by Lloyds 1912 and variousTalbot-Booth publications between 1937 and 1944. It also appears to be the same company referred to under different names in "Communist Ships and Shipping" by Harbron 1962 i.e. the Bulgarian Commercial Navigation Co. or Bulgarsko Turgovsko Plavatelno Druzhestvo. After WW2 it became Navigation Maritime Bulgare under the Bulgarian Government.