Here is a 1950's era all pressed steel "AIR MAIL ACCURACY" scale.

Manufactured by TRINER of Chicago, Illinois.

The scale weights up to 1 pound by ounce.

The "TRINER Air Mail postal scale" is 9.5" long, 4" wide.
Missing the basket. 
Perhaps you would like to add this piece to your vintage balance scale collection.
Thanks for looking !