This is a rare US 1935 Sc# 774 Plate Block of 4 MNH OG 3¢ Boulder Dam (Hoover Dam) stamps. These stamps are in excellent shape and have been well-preserved over the years. The block includes four stamps with a beautiful purple color and features architecture-related topics. The stamps were issued between 1931-1940 in the United States and have been certified as uncertified. These stamps are perfect for collectors who are looking for unique and high-quality items to add to their collection. Don't miss this opportunity to own a piece of history!