M509s2 – 20 Pesos El Banco de Sonora, espécimen. UNC184 x 84 mm. Serie DP. Impreso por American Bank Note Company, el 02 de Enero de 1911, espécimen sin firmas, horadado, números de folio en ceros, fecha SEP 24 1910 colocada con tinta morada por anverso mexico mexique messico mexiko ENGLISH: 184 x 84 mm. DP series. Printed by American Bank Note Company, on January 02, 1911, specimen without signatures, perforated, serial numbers in zeros, dated SEP 24 1910 placed in purple ink on the front.