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In October 2013, billionaire Bill Gross stamp collection was sold for over $10 million creating a record for a single day stamp sale. The highest was earned by the 24-cent 1869 Pictorial Inverted Center that fetched $750,000. The worlds’ wealthiest invest in it where the Knight Frank report found rare stamp price grew significantly with the stamps like the British Guiana 1 Cent Magenta (1856) was sold for over $8.9 million.