A subcategory, postmasters' provisionals, of particular importance in United States philately, comprises stamps that were issued by local postmasters in nations that had not yet begun to issue stamps for countrywide use. Between 1845, when the United States standardardized national postage rates, and 1847, when the post office issued its first stamps, postmasters' provisionals were introduced in eleven American cities, including New York, Providence, Rhode Island and St. Louis, Missouri.5 Many of these stamps (particularly from smaller cities such as Millbury, Massachusetts) are notable for their great rarity,6 or for their relative crudity of design.
Postmasters' provisionals also played a significant role in early history of the Confederate States of America. Many localities began furnishing them after U.S. mail service ceased delivering Confederate mail in June 1861; for it was only in October that Confederate stamps for nationwide use first appeared.
Donna O'Keefe Houseman, editor; Linn's World Stamp Almanac, Millennium (6th) Edition. ISBN 978-0-940403-85-7 /wiki/ISBN_(identifier) ↩
Rick Miller, "Lines of stamp classifications have blurred" 29 December 2016 http://www.linns.com/insights/stamp-collecting-basics/2003/april/lines-of-stamp-classifications-have-blurred.html ↩
Edifil; Catálogo Especializado de Sellos de Cuba, Tomo I (1855–1958), 2nd Ed.; Madrid, 2002 (in Spanish). ISBN 84-95019-08-6 /wiki/ISBN_(identifier) ↩
Krieger, George T.; The Postal Stationery of the Possessions and Administrative Areas of the United States of America; United Postal Stationery Society, 2009, ISBN 978-0-9800112-3-4. /wiki/ISBN_(identifier) ↩
"Postmasters' Provisionals". U.S. Philatelic Classics Society. Retrieved 2013-10-28. http://www.uspcs.org/postmasters-provisionals/ ↩
Snee, Charles, ed. (2012). Scott Specialized Catalogue of United States Stamps and Covers 2013. Scott Publishing Co. pp. 1–5. ISBN 978-0894874758. OCLC 781677423. 978-0894874758 ↩