1901 Yacht Specimens
Upon issuance of the 1901 Yacht Issues, an unknown number of copies were overprinted and distributed to post offices as specimens.
1905 / 1920 Imperforate Yacht Issues
Upon the issuance of the 1905 / 1919 watermarked Yacht Issues, imperforate sheets were printed of several of the values for the archive of the Reichsdruckerei (Reich Printing Works).
1905 Yacht Issue Color Proofs
Proof printings of the 20-, 45-, and 60 Heller values of the unwatermarked Yacht Issues were printed in several trial colors.
1901 Yacht Issue 2 Pesa Proof
Prior to printing of the first Yacht Issues, a proof was produced of the 2 Pesa issue.
1901 Yacht Issue Color Proofs
Proof printings of the 2- & 3 Rupien values were printed in trial colors that vary from the colors of the eventual issues.
British Occupation ‘G.R. MAFIA’ Overprints
Upon occupying Mafia Island, the British used a handstamp to overprint German East Africa issues for use by British forces in the area. The first issues were overprinted ‘G. R. / MAFIA’, and they can be found with black or blackish-violet ink.