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Stamp collections are a popular hobby and form of collectible, encompassing individual stamps as well as comprehensive sets and series. They often showcase a wide range of designs, themes, and historical significance from various countries around the world. Stamp collections can be categorized by different criteria such as country of origin, time period, subject matter, or rarity. The value of a stamp collection is determined by factors including condition, scarcity, demand, and historical importance. Iridescent stamps are a specific type of stamp that display a shimmering or rainbow-like effect on the surface due to the use of special inks or coatings. These types of stamps can be highly sought after by collectors due to their unique visual appeal and rarity. Stamp collections may include iridescent stamps as part of a larger collection, or they may focus specifically on these types of stamps. Overall, stamp collections offer a way for individuals to explore the history and artistry of postage stamps while also potentially appreciating in value over time. The hobby of collecting stamps can be both educational and rewarding, allowing enthusiasts to connect with other collectors and share their passion for this unique form of collectible.