Dear valued customer, The following are important notes for you. SPECIFIC NOTES ABOUT THIS ITEM. For lovers of famous printing errors, this is the best example of the Mexico Exporta series. The error consists of having been printed on the back, therefore the phosphorescence has it on the back (reverse), the normal stamps have it on the front (anverse). The philatelic community in Mexico called it the bionic bicycle.Sc# = Scott number; Mc# Michel number; Et# etiangui number The scaned item showed, is the one you will receive This. 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. 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. For mexican stamps I accept only a MEPSI certificate. The item "Mae01 Mexico Exporta MNH paper 1 printing error bionic bicycle very SCARCE" is in sale since Saturday, March 10, 2018. This item is in the category "Stamps\Latin America\Mexico". The seller is "e_tiangui" and is located in Coahuila. This item can be shipped worldwide.