Registered cover franked with 1914 5c buff & green and 3 x 10c pale blue & red SONORA 'Coach Seal' (SG S35b & S36) tied by HERMOSILLO cds's dated 13 OCT 1915 with boxed 'HERMOSILLO' registration marking in purple alongside. Addressed locally within HERMOSILLO with oval 'CERTIFICADOS HERMOSILLO' marking on reverse.