Dated January 20th, 1943 and signed A.W. Keuffel, the letter reads:

Herewith a Slide Rule known as a Vest Pocket Slide Rule made by Guedon, Camden, New Jersey. I do not think they will have much success selling this rule, because of the inherent disadvantages this metal rule has over our regular Pocket Slide Rule. Nevertheless, at the wholesale price of $.50. I do not see how they are able to make this article. After you have examined it, turn it over to Mr. Schneider for filing with the samples.