Big head
From Stamps of the World
A nickname for te New York 1845 5 cent postmasters stamp which had a portrait of George Washington. This nickname is used to distinguish it from the 1847 10 cent stamp which also shows a portrait of Washington. The 5 cent stamp utilised a die of the head of Washington, issued by the printers Rawdon, Wright and Hatch on banknotes in circulation at the time.
This term seems to be used by British collectors of United States stamps.
Collectors in the United States use this term and 'Black Jack' to refer to the 1863 issue showing a portrait of Andrew Jackson.

