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- 3-31. Provisional issues, 1889, 1890 and 1893. Fournier fraudulent postmarks: The Serrane Guide/ Stamp Forgeries of the World to 1926, p.265 (before 1-9); A.J.C.Vaurie, “Know Your Forgeries” column, The France and Colonies Philatelist (U.S.), Vol. 2 (July-August 1943): 18,19. For forgery of the basic stamps see French Colonies 24-45 and 46-59. Reprinted types a and c surcharges: Edward Denny Bacon, Reprints of Postal Adhesive Stamps And Their Characteristics, p.98. Measurements of genuine overprint on the Provisional issue, 1890: The Serrane Guide/ Stamp Forgeries of the World to 1926, p.265 (Yvert 10-18 and 19-22).
- 32-44. The “Group type issue”, 1894. Perforations of (Fournier) forgeries are reversed: Scott Classic Specialized Catalog. Also see French Congo 18-34.
Source: The Tedesco Index