1-17. “Group type” issue of 1892-1900. Perforations of (Fournier) forgeries reversed: Scott Classic Specialized Catalog. False cancellation: A.J.C.Vaurie, “Know Your Forgeries” column, The France and Colonies Philatelist (U.S.), Vol. 3 (January-February, 1944): 8. Also see French Congo 18-34.
45-47. Ballay type common design, 1906-07. David Jennings-Bramly, “The Ballay forgeries”, The Journal of the France & Colonies Philatelic Society (U.K.), Vol.41 (March 1991): 6,7. Frank Aretz, Know Your Stamps, Vol. I, pp.22,23. Fournier forgery and forged postmark. The Serrane Guide/ Stamp Forgeries of the World to 1926, p.100 (column 2). Forgeries and fraudulent postmarks: A.J.C.Vaurie, “Know Your Forgeries” columns, The France and Colonies Philatelist (U.S.), Vol. 2 (March-April 1943): 10, and Vol. 3 (January-February 1944): 8. H. Bynof-Smith, Forged Postage Stamps of Europe and Colonies, Vol. 1, pp.98,99 (Ivory Coast). Forgery of the 5fr: J. Dorn (Publisher), The Forged Stamps of all Countries, p.41.