Historic 1941 Mexican registered military cover mailed from Los Mochis, Sinaloa to Ciudad Juárez, Chihuahua.
Sent by Major of Infantry M. Portillo Reyna to Lt. Col. Manuel Abraham Herrera C. of the 12th Battalion.
Features 40 centavos Airmail and 1 peso “Soldado Con Fusil” definitive stamps (Scott #C98 & #757), tied by Los Mochis circular date cancels.
Reverse bears red embossed “Correos México Correspondencias Registradas” official seal and clear January 9 1941 receiver mark.
Excellent military postal history piece showing inter-garrison correspondence during the early 1940s.

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