Rare Stamps -- The Holy Grail of Stamp Collecting

World's Most valued Stamps 11-20 (Part II) – Philately & Stamps

Guy Buys 'Holy Grail of Postage' for $2M

Stamp collecting - Wikipedia

The 10 Most Expensive Stamps in the World

Stanley Gibbons eases its gloom by selling the 'Holy Grail' of stamps, London Evening Standard

I inherited a pretty big stamp collection from my dad. Here's just a sample - most pages are like this - some mint stuff from the late 1800s-early 1900s, and some older used stamps. Worth trying to sell these, or should I just hang on to them? : r

Postage stamp 3 cents hi-res stock photography and images - Alamy

Stamps: High-value 'miniature art' with a twist

The Value of Stamp Collections: 4 Rare Stamps That Collectors Are Looking For