1853-55 4c black imperf. plate proof with retouch above value variety and flawed second A of GUIANA, large margins, very fine and very few exist and this is possibly the finest, cert. RPS (2019). (Image)

1853-55 4c pale blue imperf. with very good to large margins, with light and clear strike of the Demerara cds, a superb used example, cert. RPS (2019). (Image)

1862-64 4c blue, perf.12 1/2-13, mint n.h. block of four, fresh and very fine (SG £480+). (Image)

1918-38 Selection of four covers underpaid to Switzerland, two from British Guiana, one a 1926 envelope franked with vertical pair of the George V 2c bright violet, tied by Taymouth Manor cds, with 25c Switzerland postage due to front, tied by Berne cds, a 1936 George V 6c deep ultramarine tied to envelope by Buxton cds, sent to Schweiz, with 30c postage due tied by Rach cds, also included is a rare cover sent from Trinidad and Tobago, franked with 6c sepia and blue (SG233), with Georgetown, British Guiana cds to front, tax mark and Switzerland 30c postage due, tied by faint Zurich cds, and also an official envelope, headed up, On His Majesty's Service, from the General Post Office, Nassau, no stamp, sent to Berne with 50c postage due applied on arrival; a very fine selection, rare and scarce examples. (Image)