Known as the world’s most valuable and rare stamp, this unique piece was produced during a stamp shortage in British Guiana. Only one copy is known to exist, discovered by a 12-year-old Scottish ...

In the 1920s and ’30s, clerks at The Times collected stamps from overseas mail. The postage tells of a fluid world history. By David W. Dunlap In the In Times Past column, David W. Dunlap ...