Anotado

Anotado in script was a validating overprint on Mexico's 1868 issue (Full-face Hidalgo). Due to massive amounts of postal forgeries in post office stocks since 1869, all stamps were called in to be so overprinted in 1872. Both the postal forgeries ("Tipos") and genuine stamps were handstamp overprinted. These were generally stamps with consignment dates of 1870, 1871 and 1872 ("70", "71", "72"). They were used in Mexico City (with the Gothic Mexico overprint) and rarely in other places, perhaps out of need since the new issue of 1872 ("Garbancitos") was not immediately ready for release.

Forgeries outnumber genuine overprints by a wide margin. There are also some very accurate forgeries. The MEPSI organization has created pages on this issue that should help a lot. See: here.

More references
 File:Mexico fake anotado.jpg|Forged Anotado overprint. 
 * Mexico, The 1868 Issue, A Specialist Handbook, by John Heath and Doug Stout (a MEPSI publication)
 * A Catalogue of the Stamps of Mexico, 1856-1910, by Nicholas Follansbee (self published)

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