1961 Wrigley Field Postcards
The backs remind me of the 1961 Wrigley Field Exhibit Postcards, except for the lines under the stamp box. Most of the 1970's and 1980's postcards generally have more information on the backs, plus a zip code. It would be nice to get a definitive answer. The Keyman site is saying late 1950's thru the 1960's.
What was the original use of the Charles Conlon photo prior to TCMA using it?
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