The Vintage KEUFFEL ESSER K+E Leroy Lettering Guide Set of 4 is a rare and valuable collectible set that showcases the craftsmanship and quality of American engineering in the mid-20th century. Made by the renowned brand KEUFFEL & ESSER in the United States, this set of lettering guides is a unique piece for collectors interested in vintage drafting tools. The modification of these tools adds to their rarity and appeal, making them a sought-after item for those passionate about the history of engineering and drafting.