Vintage Pan American Clipper Cargo Dimensional Weight Computer, 1957

Description

Vintage Pan American Clipper Cargo Dimensional Weight Computer, 1957. Condition is "Used". Shipped with USPS First Class.
This Clipper Cargo Dimensional Weight Computer is made of 2 pieces of cardboard which is riveted together at the corners.
It has two dials which move freely to calculate the weight of a shipment.
The inside card is the weight converter, also sliding freely, converting pounds to Kilograms and Kg to pounds.
The numbers can be seen in the little cut out spaces.
The bottom of the chart is marked: "PAN AMERICAN, LEADERS IN AIR CARGO"
Measuring 4 inches x 6 inches, the small print says
"Slide-Chart Copr. 1957, PERRYGRAF Corp., Maywood, Ill
*TM Reg U.S.Pat. Off."
Perrygraf was a very successful producer or promotional slide charts.
The back of the card promotes TIME magazine, as you can see in my photos.
It mentions the Clipper Cargo ads which appeared regularly in the pages of Time magazine.
Metal rivets at the corners are intact, as is the one in the center.
I'd say this is in excellent condition. Please look carefully at all photos.
There is an example of this item in the Smithsonian National Museum of American History, without the Time advertisement on the back.
It is a great piece to add to a collection!