This set of three vintage keys includes a unique U.S. Government key marked "Do Not Duplicate" and two keys with the feature, “Duplication Prohibited” and “It Is Unlawful to Duplicate This Key”. These collectible keys are perfect for any collector of locks, keys, or even for those who appreciate Americana memorabilia. The keys were manufactured in the United States and are of the cut variety. The set is perfect for display or for use in DIY projects. Add these vintage keys to your collection today! Please view pictures for size and condition.