Self-correction department:
It appears that I was in error with regard to the brown toned Exhibit cards, as these continued beyond 1939. Also, the use of the legend "MADE IN USA" continued through 1950, not 1947. However, the use of the logo "Made in USA" is in fact generally believed to be part of original printings in the 1951-1953 period, with, as stated, "PRINTED IN USA" used with 1954-1956 cards, and "Printed in USA" for 1957-1966 Exhibits.
My appologies.
Larry
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