This 1904 British stamp is extremely rare because nearly all of the 19 sheets ... in 1847 or 1846 (it’s said to have been used as postage for a love letter between two cousins).

An early 20th-century postage stamp was a clear marker of national identity. In Ireland, which was then part of the United Kingdom, the only way to send a letter was to affix it with a British stamp, ...