10c salmon postal stationery envelope (H&G B2 with pointed flaps, variety unlisted) used with SAN MIGUEL cds in blue dated 13 VI 1888, endorsed 'Via Acajutla' in red with ACAJUTLA transit cds on front dated 26 VI 1888. Addressed to USA with fine SAN FRANCISCO PAID ALL cds in red on front and various other transit marks on reverse. Fine & rare.