There is no postmark on this one but it seems to be from the 1950s or so.
NATURAL COLOR PHOTO
DORNEY PARK, ALLENTOWN, PA.
The flag shown on the reverse side was a special Labor Day decoration. It was made of thousands of white and red apples for the stripes. Egg plant was used for the blue field and squash was used for the stars. Thousand flock to the amusement park each year to see the designs made entirely of fruits and vegetables for Labor Day holiday.