Here’s a brief article and photo from the March 1 1933 edition of the Toronto Daily Star of stamps issued by a man who had proclaimed himself king.

Martin Coles Harman (1885-1954) was an English businessman who bought the island of Lundy, located in the Bristol Channel, in 1925. When postal service was discontinued on the island in 1927, Harman covered all postage costs himself for the next two years. In 1929, he issued the postage stamps shown above to cover these postage costs. The unit of currency on these stamps was the puffin, with one puffin being roughly equivalent to one English penny. They are still printed today.
In 1931, Harman decided to go one step further and print his own coins, producing half-puffin and one-puffin coins. He was charged under the Coinage Act and was fined five pounds plus fifteen guineas expenses.
Life dealt Harman a number of blows at this time. In 1931, his wife died of kidney failure. In 1932, he went bankrupt. In 1933, he was charged with conspiracy to defraud and was sentenced to 18 months in prison. Saddest of all for him: he lived long enough to see his son, John Harman, die in battle in the Second World War after winning the Victoria Cross for bravery.
The island of Lundy was purchased by Jack Hayward in 1969 and donated to the National Trust. It is now best known for its birds and its shipwrecks.