On reverse it shows the legend "10 Ds. 20 Gs" (10 Dineros 20 Granos); it is a specification of silver fineness used on colonial times. Pure silver was 12 Dineros, and each Dinero was fractioned on 24 Granos, so 10Ds+20Gs= 10/12 + 20/288 = 83.333% + 6.925% = 90.27% = Silver 903. NOTE: many different varieties in mintmarks.
1 = Real de Catorce (Ce). 3 = Culiacan (Ce, Cn). 5 = Estado de Mexico (EoMo).
7 = Guadalupe y Calvo (GC). 8 = Guanajuato (G, Go). 10 = Mexico City (Mo). 11 = Oaxaca (O, Oa). 12 = San Luis Potosi (Pi).This item is in the category "Coins & Paper Money\Coins: World\North & Central America\Mexico\Second Republic (1867-1905)". The seller is "rr_numismatics" and is located in this country: PT. This item can be shipped worldwide.