1889 Envelope endorsed "HMS Griffon, Pemba" whilst on anti-slave patrol, sent to England with 1887 2d Jubilee tied by barred oval on arrival, paying the sailor's concessionary rate, countersigned by the commanding officer, fine and very rare, the only known cover from Pemba on slave patrol (Image)

1898 Incoming 5c postal stationery envelope from Monaco sent to French post office at Zanzibar, underpaid and charged with two 3a postage dues tied by double circle ds, fine and very rare, Griffith-Jones records only 14 covers displaying the use of the French offices at Zanzibar postage dues on cover (Image)

1890 (Sep 2) German post office at Zanzibar parcel piece bearing 2M block of four, inner-panneau 50pf strip of three & solo 10pf tied by grey-blue ZKDP cds which was only in use for a few weeks in September, an exhibit showpiece of Zanzibar & German foreign post office (Image)

1895-98 2 1/2 (type 4) on 1a plum mint lh, very fine, cert. Sismondo (2017) (SG £475) (Image)

1897 1/2 on 4a Myrtle-Green with Roman "I" for "1" in 1/2 surcharge, unused, unlisted but known variety, cert. RPSL (2016) (Image)

1908-09 100R Black & Steel Blue mint og, gum slightly toned and light horizontal gum crease barely noticeable, scarce, cert. Sismondo (2017) (SG £1'300) (Image)