A) 1946, COSTA RICA, CARIBBEAN Y CENTRAL AMERICAN FOOTBALL CHAMPIOSHIPS. AIRMAIL, THE SET OF LARGE FORMAT SUNKEN DIE PROOFS BY THE AMERICAN BANKNOTE, FOR THE 25C IN GREEN, 30C DULL YELLOW AND 55C DEEP BLUE, ENGRAVED CARDS, WITH FILE NUMBERS FROM 86972-86974, AT TOP AND ABN IMPRINTED BASE FRESH AND VERY FINE COMPLETE SET, RARE AND MOST ATTRACTIVE