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- 1-12. Overprinted Cuban issues, 1873-76. Fakes: The Serrane Guide/ Stamp Forgeries of the World to 1926, p.282 (Yvert 1-12). For more citations see individual listings below.
- 1-3. 1873. Forged overprint on the 50c brown: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.145,53. Forgery of the 1p: R.B. Preston and M.H. Sanborn, “The First Puerto Rican Issue of 1873”, Stamps (U.S.), Vol. 44 (September 18, 1943): 417-19,27, at p.419.
- 4. 25c ultra, 1874. Two forged overprints: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.146,47.
- 6,7. 50c and 1p values of the 1875 issue. Forged overprints and reprint of overprint on the 50c stamp: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.148-52. R.B. Preston, “The 1873-1876 Overprinted Issues”, The Stamp Specialist, 1943, pp.65-88.
- 8-12. Overprinted Issues of 1876. Forged overprint on the 25c (overprint type c), 50c and 1p (both): R.B. Preston, “The 1873-1876 Overprinted Issues”, The Stamp Specialist, 1943, pp.65-88. Forged overprint on the 50c: Fritz Billig, Billig’s Philatelic Handbook, Vol.6, p. 153.
- 13-17. King Alfonso XII, 1877. Forgeries of the 5c and 10c: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.154-57. Sperati forgeries of the 5c carmine error and 10c brown error, other Sperati forgeries: Robson Lowe and Carl Walske, The Work of Jean De Sperati II/ Including Previously Unlisted Forgeries, pp.71,72. Fiscal cancellation: J. Dorn (Publisher), The Forged Stamps of all Countries, p.208.
- 19. 10c dated “1878”, 1878. Sperati forgery: Robson Lowe and Carl Walske, The Work of Jean De Sperati II/ Including Previously Unlisted Forgeries, p.73.
- 87,91,93,126,130,132. 4m,6m,8m,40a,80c yellow green, 80c black values of the regular issue of 1890-97. Sperati forgeries: British Philatelic Association (Publisher), The Work Of Jean De Sperati, pp.137-39 and Plates 88 and 89. Forgery of the 80c yellow green, 1890: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.167,57.
- 133. Landing of Columbus, 1893. Three forgeries: Mercer Bristow, “Forged Columbus commemorative easy to detect”, Stamp Collecting, Vol. 74 (October 9, 2000): 22. Don Glickstein, “Poor Don’s Almanac”, American Philatelist, Vol. 100 (February 1986): 154,55. Three forgeries: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.158-61. R.B. Preston, “The Puerto Rican Colombian Commemorative Stamp of 1893.”, The Stamp Specialist, 1942, pp.61-68. George B. Sloane, “Sloane’s Column”, Stamps (U.S.), Vol. 39 (June 6, 1942): 337. Fournier forgery: The Serrane Guide/ Stamp Forgeries of the World to 1926, p.282 (Yvert 101). J. Dorn (Publisher), The Forged Stamps of all Countries, p.208.
- 135-54. Left-facing head of King Alfonso XIII, 1898. Forgeries, Fournier forgeries of the 80c, 1p, 2p values of the regular issue of 1898 (152-54), and Fournier fraudulent postmarks: The Serrane Guide/ Stamp Forgeries of the World to 1926, p.282 (Yvert 131-50). J. Dorn (Publisher), The Forged Stamps of all Countries, p.208. Forgery of the 40c: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, p.162.
- 154A-70. Handstamped overprint, 1898. Private reprint of overprint and forgeries: Jaime Gonzalez, “‘Habilitado’ Overprints For The Years 1898 And 1899” (tran’l by C.M. Franklyn), Pan American Philatelist, Vol. 1, No.5 (1955): 109-11.
- 200,1. The Postmasters Provisional stamp, 1898. R.B. Preston, ‘The Postmaster Provisionals of 1898”, The Stamp Specialist, 1948, pp.65-81. Geoffrey Brewster, “Plating the Coamo Stamp“, Possessions, Vol. 24 w.n. 89 (Third Quarter 2003): 24-28. R.B. Preston, “The Provisional Stamps of Puerto Rico – 1898“, American Philatelist, Vol. 50 (July 1937): 512- 19. Forgery of the Ponce issue and five forgeries of the Coamo issue: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.163-69.
- 210-16, J1-J3. U.S. Administration, overprinted U.S. stamps, 1899 and 1900. Forged overprint: Arthur J. Trumbull, “Overprinted U.S. Postage Stamps”, The Bureau Specialist, Vol. 20 (February 1949): 32,33. Forged overprint on the 1900 issue: Fritz Billig, Billig’s Philatelic Handbook, Vol. 6, pp.170-74. Two forged overprints: R.B. Preston, “The Overprinted Issues for Puerto Rico: The Counterfeit Overprints”, American Philatelist, Vol. 51 (March 1938): 558-60. J. Dorn (Publisher), The Forged Stamps of all Countries, p.208.
- Sperati fraudulent cancellations: British Philatelic Association (Publisher), The Work Of Jean De Sperati, p.139 and Plate 90.
Source: The Tedesco Index