We offer The Best of the Stamp collecting true gem of Postal history
Inverted Centre Stamp Manama
Michel Block 103v, Sellinger 1, MNH.
1971 Baden-Powell portrait by David Jagger,
20r Souvenir Sheet with gold leaf stamp inverted
According to Sellinger, less than 100 exist.
Some stamps used to require a second or third manual feed through the printing press after changing the ink in the press. When the sheet was accidentally fed upside-down for its second passage through the press, an inverted centre would result.