The product is a single original postcard featuring U.S. submarine boats with a humorous design of sharks and porpoises. Manufactured in 1906 in the United States, the postcard measures a standard size of 5.5 x 3.5 inches and was printed on cardboard and paper materials. With a navy theme and a divided back era, this postcard is undivided and unposted, making it a unique collectible item perfect for exploring historical naval imagery and humor from the early 20th century.