Falkland Islands: Formula Registered Envelopes: Early use, 1901 (Nov. 12) to U.S.A. at 41/2d. rate paid by 1/2d. yellow-green (3) and 1d. pale red (3) tied by F.4A c.d.s's with "(crown)/REGISTERED" mark and red London Dec. 7 transit, backstamped New York Dec. 16 arrival. Carried on the "Oropesa". Perkins A.2. Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1902 (June 27) to Switzerland, franked by 1891-1902 2d. and 21/2d. tied by F.4A c.d.s., carried on the "Oropesa" with London transit and La Chaux-de-Fonds June 25 arrival on reverse, scarce early use to a foreign destination. Perkins A.1. Ex Riddell-Carre. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1902 (Dec.) to Jersey bearing 1898 5s. (oxidised) tied by indistinct F.4B c.d.s. and red London Feb. 3 transit and next day Millbrook arrival. Perkins A.2. Ex Riddell-Carre. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1909 (Nov. 27) to Canada franked at double rate by 1904-12 1/2d. strip of four and 2d. tied by F.4E c.d.s's. with type 2 registration label and 2d. registration fee unusually added in ms. at lower left, with London Dec. 29 transit and backstamped Montreal Jan. 8 1910 arrival. Perkins B.3. Ex Riddell-Carre. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1911 (Jan. 16) to England franked by 1d. and 2d. cancelled by superb F.4C c.d.s. with type 2 registration label, carried on the "Oropesa" with London transit and Derby arrival of Feb. 20. Perkins B.3. Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1913 (Dec. 20) to 'Kiderlen' in Germany franked at 6d. double rate by very scarce usage of 1904-12 2d. reddish purple vertical pair and single tied by good PS.1A c.d.s's with type 4 registration label at left, Ulm Jan. 16 arrival on reverse. B.P.A. (1968) and Heijtz (2012) certificates. Perkins B.3. Ex Riddell-Carre. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1914 (Apr. 13) envelope addressed to the Army & Navy Co-operative Society in London, bearing 1912-20 3s. green tied by F.4C Apr. 2 c.d.s. but delayed, showing F.6 Apr. 13 despatch and type 4 registration label at left, carried on the "Oriana" with May 12 arrival. Perkins B.2 Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1916 (Mar. 10) to U.S.A. at 41/2d. rate paid by 2d. and 21/2d. tied by F.4C c.d.s. with type 5A registration label showing malformed "R", carried on the "Victoria" with Liverpool Apr. 19 and Chicago May 4 transit datestamps, Minneapolis May 4 arrival. Perkins B.5. Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1920 (June 14) to U.S.A. at 41/2d. rate paid by "WAR STAMP" 1/2d., 1d. (two pairs) tied by F.4F c.d.s's with type 5A registration label, carried on the "Duendes" with London Aug. 24 and New York Sept. 2 transit datestamps, Jackson, Mich. Sept. 4 arrival, minor bend at left. Perkins B.6. Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1920 (June 14) to Birmingham bearing 1912-20 5s. reddish maroon (S.G. 67a) additionally tied by Aug. 24 red London registered transit d.s. with type 5B registration label below. Perkins B1(b). Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1920 (July 6) commercially used to Huddersfield bearing 1912-20 2d. purple and "WAR STAMP" 1d. (2, some oxidisation), from the Fourth Overprinting, one showing the broken "M", "-" for "P" variety state 3 (SH 36IV t13), tied by F.6 c.d.s's and one by red London Registered Aug. 24 transit datestamp, with type 5A registration at left, . Heijtz certificate (2012). Perkins B.1a. Ex Heijtz and Riddell-Carre. Photo. The only recorded example of this rare variety on cover. (Image1)

Falkland Islands: Formula Registered Envelopes: 1920 (Aug. 30) to U.S.A. franked 6d. at 2oz. rate, cancelled PS.1B with type 5A registration label alongside, carried to Punta Arenas on the "Huanchaco" where transferred to the "Oropesa", backstamped Liverpool Dec. 14, Boston, MA Dec. 25 and Exeter, NH Dec. 27 arrival. Perkins B.1(a), late use. Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1923 (Apr. 28) to U.S.A. franked 6d. tied by PS.1B c.d.s. with type 5C registration label (torn corner), carried on the Norwegian whaler "Ronald" to Montevideo with Southampton June 2 and St. Louis, Mo June 16 transit datestamps, Denver arrival June 17, scarce. Perkins C.4 Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1923 (Oct. 4) to Kent franked 1/2d., 1d. and 21/2d. purple on yellow (1d. rate + registration) and with type 5B registration label, carried on the "Oriana" with Liverpool Nov. 23 transit and same day Maidstone arrival, rare late use. Perkins C.4. Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1928 (Nov. 14) to U.S.A. bearing 3s. slate-green with central PS.1B c.d.s, London Dec. 18 transit alongside, type 6 registration label at left, New York transit and Toledo Jan. 3 arrival datestamps on reverse. Perkins D.2. Ex Riddell-Carre. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1933 (Apr. 11) to U.S.A. slightly overpaid by Centenary 6d., second printing, tied by PS.1B c.d.s. with type 5D registration label torn on opening, showing New York May 26 transit and Rochester, Missouri May 31 arrival before redirection to Rochester, Minnesota. Perkins D.7. Ex Riddell-Carre. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1934 (Feb. 11) to U.S.A. at 2oz. rate paid by Centenary 3d. and 4d. cancelled PS.1A with type 8 registration label and carried to Punta Arenas on the "Reina del Pacifico" during its world cruise, with New York Apr. 4 transit and Englewood, NJ next day arrival datestamps. Perkins D.9 Ex Cottis. Photo. (Image1)

Falkland Islands: Formula Registered Envelopes: 1937 (July 26) to Canada, bearing Coronation 21/2d. pair paying 2oz. rate cancelled PS.2A with re-used "(crown)/REGISTERED" marking, Toronto and Montreal transit and Sherbrooke Sept. 11 arrival datestamps. Perkins E.5. Ex Cottis. Photo. (Image1)