These four post cards contain a whole lot of mystery. The first is a tongue-in-cheek mystery: Where did they get food that grew so large? The other mysteries are things like: Who printed these cards? Who published the cards? Where were they sold? Why are they printed in black and white? How old are they?
If you look at the numbers on the flat cars (right side) you might conclude that these cards were part of a series published by the company - whoever they were.
A careful look at the post card with the flat car holding the watermelon foreshadows this border. If you look to the right-hand edge of the post card you will see that there is white space between the scene and the edge of the card. Unfortunately, it is not something that was done on purpose. This card is at the bottom of the picture below. You can imagine that the part of the watermelon is missing from the left side of the card. It could easily be the width of the white stripe on the right.
This post card is at the bottom of the picture below. You can see that the box that contains the words, “PLACE STAMP HERE” is very close to the edge – compared to the three above it. This card didn’t go through the cutting machine very neatly. Another mystery: Who was on quality control?