10c Brown (161).
Two, deep rich color and proof-like impression, natural s.e. at left, tied by partly clear strike of red New York Foreign Mail Star
cancel, matching "New York Paid Aug. 10 Sup." Type E Supplementary Mail
circular datestamp on cover with printed address to Amsterdam, Holland,
addressed to the major publishing firm of J. H. Laarman, red "6" credit crossed out and re-rated "5", sender's "Pr America"
ship directive and carried on that NGL steamer from New York on August 15, arriving Southampton August 26, red "London Paid" transit datestamp (Aug. 27, 1874) and matching "PD" in circle, Amsterdam receiving backstamp (Aug. 28), Very Fine, one of five recorded covers to the Netherlands posted by Supplementary Mail at the 10c British Mail "Phantom Rate", an article by George E. Hargest ("New Light on the Operation of the Dockside Offices", Chronicle,
May 1971, pp. 103-105) states: "In May 1874 the only published rate to the Netherlands was a 10 cent rate by direct closed mail via England. Letters by this route bear no British markings. Although existing U.S.-British conventions provided a 10 cent rate by British mail, regulations did not authorize its use. The markings on this cover, however, indicate that the dockside office sent it in a supplementary British mail, i.e., by an unauthorized route, at an unannounced 'phantom' rate." Each of the four recorded British Mail "Phantom Rate" covers to Holland has two 10c stamps, one of which paid for Supplementary Mail service. All four covers have a "6" credit marking crossed out and re-rated "5", which we cannot explain, since the correct credit to England was 6c. The covers are dated Aug. 13, 1873 (offered in lot 2287), May 16, Aug. 10 (offered here), Aug. 29 (ex "Andromeda", Siegel Sale 1008, lot 2125) and Sep. 12, 1874.
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