Check the listing for details. Case XX Eisenhower Pen Knife.Rare. Never Been Sharpened. Condition: Used. Listed at 65.00 USD. The Case XX Eisenhower Pen Knife is a rare and unique collectible folding knife that has never been sharpened. Handmade by Case, a renowned brand in the knife industry, this knife features a pen blade type, making it a versatile and functional piece for collectors or everyday use. With its high-quality craftsmanship and historical significance, this knife is a valuable addition to any collection of modern folding knives.