Watch List notes:

M4639Bs2 – 20 Pesos Banco de México, 1970 Espécimen. UNC. 158 x 67 mm. Serie BIH. Impreso por American Bank Note Company, el 22 de julio de 1970, folios en ceros, firmas impresas y horadadas

ENGLISH:
158 x 67 mm. AAW series. Printed by American Bank Note Company, November 8, 1961, zeros as seria number, signatures pierced.