10c dull violet 'Seebeck' postal stationery envelope (H&G B41) used with added 1898 10c violet 'Seebeck' issue (SG 112) tied by fine strike of oval LA LIBERTAD cancel in purple dated ABR 1898. Addressed to GERMANY with JUIGALPA and CORINTO transit marks and German arrival cds on reverse. Scarce origination at this date.