English: An electrum stater ('South Ferriby type') of the Corieltauvi tribe of the British East Midlands, mainly in Leicestershire and Nottinghamshire. The coin is around 30 percent gold with the bulk of the rest being silver and the balance copper. This coin was found near Boston in Lincolnshire and was very probably minted at the Iron Age mint at Sleaford around the middle of the first century BC. It was exceptionally well struck and saw almost no circulation and thus preserves the type in almost perfect original condition These coins depict a stylized horse on one side and a pattern of pellets on the other. The design represents copies of copies of copies of coins originally produced by Philip II of Macedon in the fourth century BC. The pellets were derived ultimately from the Macedonian ruler's hair. Guy de la Bédoyère