One of those troves, which contained 50 South African solid gold coins, was unearthed in Milton Keynes, a town about 50 miles northwest of London.
It's a mystery how those coins, minted in the 1970s during South Africa's apartheid era, wound up buried in a British backyard after a half-century.
The other major coin hoard, which held 63 gold coins and one silver coin featuring monarchs Edward IV and Henry VIII, was likely buried in the 16th century. It included coins bearing the initials…