'PAA Grace' airmail envelope franked with 1936 5c blue & 20c carmine (SG 276 & 285) tied by large AGENCIA POSTAL DE COLON PRIMER VUELO DIC. 4. 1936 COLON - LIMA REP. DE PANAMA first flight cds in purple with fine second strike alongside. Flown on the Colon - LIma, Peru first flight with CRISTOBAL CANAL ZONE transit cds on front and LIMA, PERU arrival cds on reverse. (Muller #Unlisted)