26British Royal Postage Stamp
Until 2005 the only living people to appear on British stamps were the Queen and the drummer of the Queen.
27. To prevent people from reusing canceled postage stamps by washing off the ink, early stamps were embossed with 'grill' indentations so that the ink would be more readily absorbed by the paper.
28. In 1954, Warren Buffett tried to corner the market on Blue Eagle stamps. He bought almost 400,000 of them, expecting 2,500% gains from desperate collectors. The demand never materialized and he ended up selling his stamp stash at a loss in 1982. He never bought collectibles again after that.
29. The Dag Hammarskjöld Invert 4-cent stamp was intentionally reprinted to prevent the stamp from gaining value from a USPS error.
30. U.S. stamps may not visibly depict any person who has been dead for less than 10 years, except for ex-Presidents who may appear one year after their demise.
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31Anti Alcoholism Stamp
In 1981, the US Post Office issued an anti-alcoholism stamp that said "Alcoholism: You can beat it!" Though well-intentioned, it was a huge flop mainly because it could look like the sender was sending a specific message to the recipient.
32. British stamps are the only stamps in the world not to contain the country name as standard. This is because, when the stamp was invented, it was only ever used in the UK.
33. There is a special name, "Errors, Freaks, and Oddities," or EFO, for postage stamps that have had some mistake in their creation, and it can increase their value. Some of them are the most expensive stamps in the world.
34. The Panama Canal was supposed to be built in Nicaragua, but a 1¢ mail stamp of an erupting volcano mislead the congressmen into thinking that Nicaragua was too dangerous of a place to building a canal, so they chose to build the canal in Panama instead.
35. It's estimated that 10% of San Marino's revenue is generated by the sale of its postage stamps to international collectors. The government of San Marino has the world's only philatelic minister of state.
