DONALDSON BROTHERS & BLACK LTD.

Bonsor gives D51 from 1878, D52 from 1935 and D51 again from 1954. Anchor-Donaldson ships flew the Anchor flag at the foremast and the Donaldson flag at the mainmast. Merchant Ships nevertheless assigns D52 to all the companies in its 1949 account.

Griffin shows a tapered swallowtail with a black letter, a version Rosanoski found unsupported elsewhere.