Filofax, one of the most famous names in personal organisers, has been sold to UK diary maker Letts for £17 million ($24.25 million). The Filofax group makes leather bound organisers that became a must-have product during the boom years of the 1980s. At its peak Filofax sold 6.5 million organisers a year. It floated in 1987 when it was worth £12m.

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