These embossed stamps are usually found in legal offices where they are used to imprint a seal to add authenticity to documents. Such a seal was imprinted on Percy Draper's Insurance Policy as shown in my post, 1906 Percy's Policy.
So what kind of imprint stamp would Noah have used? It would have needed to be portable and thus small and easy to carry.
My research led me to what is commonly called a Pocket Seal and often came with a leather case. A person would order a Pocket Seal with an affixed stamped disk showing his own design.