Registered cover franked with single 1892 2c carmine 'Map' issue (SG 12b) and 1900 10c black on pale blue 'Registration' issue (SG R29) tied by PANAMA duplex cancel dated 16 MAR 1900 and the registration issue with blue '2189' registration number. Addressed locally within PANAMA CITY with RECOMENDADOS PANAMA arrival cds dated 16 MAR 1900 on reverse. An exceptionally rare internal 12c rate registered cover.