Found this great 1964 New York World's Fair, Shea Stadium Postcard. Parking lot full of cars. But I don't think the game was sold out. Fantastic card!
William A. Shea Municipal Stadium - Flushing Meadow Park, Queens - Operated by Department of Parks - City of New York - Official World's Fair postcard by Dexter Press, Inc. - Unisphere presented by United States Steel.
The stadium seats 55,000 for baseball and 60,000 for football. It will be used during the summer of 1964 and 1965 for sports attractions presented in cooperation with the World's Fair.
Final portion of the demolition of Shea with new Citi Field in the background. Found on Flickr @ edogisgod's photostream.
On January 31, Mets fans all over New York came to Shea for one final farewell to Shea Stadium. Fans took a tour of the site, told stories, and sang songs. The last remaining section of seats was demolished on February 18, 2009. Fans stood in awe as the remaining structure of Shea Stadium (one section of ramps) was torn down at 11:22 AM that morning.