Quote from eyestrane on January 22, 2024, 11:03 am

Check your collections!

1. The Penny Black (Great Britain, 1840): The world's first adhesive postage stamp, featuring a profile of Queen Victoria. It is highly sought after by collectors.

2. Inverted Jenny (United States, 1918): A famous U.S. stamp with an error where the biplane is printed upside-down. Only a small number were produced.

3. British Guiana 1c Magenta (British Guiana, 1856): Considered the rarest stamp in the world, it is a one-cent stamp with a simple design but exceptional rarity.

4. Treskilling Yellow (Sweden, 1855): A Swedish stamp with an error where the color was mistakenly printed yellow instead of green. Only one copy is known to exist.

5. Blue Military Stamp (Bavaria, 1849): One of the first stamps issued in the world, it features a blue design and is highly valued by collectors.

6. Red Mercury (Austrian Netherlands, 1850): Known for its distinctive red color, it is one of the early stamps issued in the Austrian Netherlands.

7. Basel Dove (Switzerland, 1845): Considered one of the world's first tricolor stamps, it features a white dove on a blue background.

8. Cape of Good Hope Triangulars (Cape of Good Hope, 1853): Triangular-shaped stamps that are among the first issued in the Cape of Good Hope.

9. Hawaiian Missionaries (Hawaii, 1851): Some of the earliest stamps issued in Hawaii, known for their missionary-themed design.

10. Orange Free State Postage Due (Orange Free State, 1903): A rare stamp from the Orange Free State featuring an overprint for postage due.