This is a rare find for stamp collectors! A plate block of 12 US stamps, featuring #1527 Expo 1974 and the 'Preserve the Environment' theme. This gem-grade item is from the United States and is currently uncertified, making it a great opportunity for collectors to add their own touch to its certification. The plate block/multiples category and United States and Stamps subcategories fit this item perfectly. This is a unique piece that any collector would be proud to add to their collection.