Cover franked with pair 1914 5c orange & green SONORA 'Coach Seal' issue (SG S35a) tied by fine strike of O.P.A. No. 205 4A DIVISION SUP-GUAYMAS. SON duplex cds dated 7 OCT 1914 (travelling post office on the Ferrocarril Sud Pacifico de Mexico line). Addressed to USA with NOGALES transit cds on reverse.