The box says "Congress Playing Cards Cel-U-tone finish" at the top 

at the bottom, the box says, "Canasta Packing"

Both decks are Monticello, Thomas Jefferson's home

Cards are trimmed in gold

Made in the United States, probably from the 1950s or 60s

Also included is a booklet called "Canasta The Official Rules" as compked by Josefina Artayeta de Viel

and How to Play by ralph Michaels from 1949