The world's greatest private collection of coins is expected to sell for $220million (£150million) in a record-breaking series of seven auctions at Sotheby's and Stack's Bowers Galleries.

Gathered over more than 30 years by Texas property developer A. Mack Pogue and his son, D. Brent Pogue, the collection contains coins from the early years of the American republic, from 1792 to the 1830s.

These are the most sought-after U.S. coins in existence, as the crude production techniques of the period meant that the coins were fragile, making surviving high-quality examples are extremely rare.

The Pogue collection includes two examples of the coveted 1804 silver dollar, considered to be the most famous coin in America, which is known as 'the pinnacle of coin collecting'.

One of these is valued at $9.8million (£6.7million). Notably, it was presented to the Sultan of Muscat in 1835.

D. Brent Pogue, from Dallas, Texas, has now decided to 'cash in his cash' by auctioning off more than 650 individual coins at a number of Sotheby's and Stack's Bowers Galleries sales over the next two years.

Experts expect the collection to sell for almost $220million (£150million), more than any other series of rare coins.

On Friday, Sotheby's showed off the jaw-dropping collection at its saleroom in New Bond Street, London.

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The most valuable coins in the world: Texas property developer's treasured collection from the early years of the American republic is expected to fetch more than $220MILLION at auction (www.dailymail.co.uk/news/article-2993515/The-valuable-coins-world-Texas-property-developer-s-treasured-collection-early-years-American-republic-expected-fetch-220MILLION-auction.html#ixzz3UHrviCkM)