English financier and one of the few private individuals—particularly, one of the few persons while alive—to have his portrait on coins.

Harman engaged in questionable dealings that led to bankruptcy in 1932 and imprisonment in 1933–34 for fraud. In 1925 he purchased for £16,000 the island of Lundy, in the Bristol Channel off the northern coast of Devon. He was an absolute ruler of the island, making laws and controlling all employment.

For use on Lundy, Harman issued bronze coins bearing his portrait, the date 1929, and the valuation of one puffin (equivalent to the British penny) or half-puffin, the name referring to a seabird that breeds on Lundy. The coins were issued contrary to British law, and in April 1930 a nominal fine was imposed on Harman. The British government, however, did not protest the issuance of private postage stamps by Harman and subsequent owners of Lundy. Souvenir sets of the Lundy coins were struck in 1965 from the original dies.