Watch List notes:

M4640Bs2 – 50 Pesos Banco de México, 1961 Espécimen. UNC. 158 x 67 mm. Serie AAW. Impreso por American Bank Note Company, el 8 de noviembre de 1961, folios en ceros, firmas horadadas

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