Cover franked with 1896 15c blue green 'Seebeck' issue (SG 164) tied by fine strike of SERVICIO DE CORREOS DEL EXTERIOR SAN SALVADOR 'Sawtooth' cds in purple dated AUG 3 1896 with fine second strike alongside and small SERVICIO DE CORREOS SAN SALVADOR cds also on front. Addressed to BELGIUM with transit & arrival marks on reverse. Very attractive.