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Dear valued customer,

For lovers of famous printing errors, this is the best example of the Mexico Exporta series. 

The error is that the stamp printing workshops did not detect that the paper manufacturer (paper supplier) sent a section of the roll with the gum applied erroneously, that is, the gum was applied to the phosphorescent side, instead of applying it on the non-phosphorescent face. Later, the printing shops printed the stamp on the side that did not have the gum, as it should be, and therefore the error is identified because the phosphorescence is on the face of the gum. 

It is popularly defined as "printing error", but rather it should be called "paper manufacturing error".

It is only known  in used condition.

The philatelic community in Mexico called it the bionic bull ( vaquita )

Sc# = Scott number;  Mc# Michel number; Et# etiangui number

The scaned item showed, is the one you will receive

This challenging Mexico Exporta series, globally known and very popular, is being collected according to the criteria of the 14 papers, going well beyond Scott and Michel listings, if you have not done so yet, go ahead and start studying the characteristics of the 14 papers, you can find inside my ebay store, a complete "classification listing" and a "classification guide" of all the stamps of this series, ordered by papers, look for them in the "other" sub-category under the corresponding series category.

The paper classification is made according to: watermark, normal or granite, luminescence on both sides, thickness and satin finish. The stamp classification add: denomination, color, perforation, burelage, and plate size.

The paper 1 characteristics: medium thickness ( 85g/m2 ), w/o watermark, glossy, phosphorescent anverse, blue violet reverse

Period of emission: 1975 thru 1981

The number of stamps listed or classified are: Scott 153,  Michel 170, TIEV  232, etiangui 326. ( TIEV = innitials for Mexico official printing workshop )

All Mexico Exporta etiangui 326 stamps could be found here at etiangui Ebay store  ( stores.ebay.com/etiangui/ )