A biscuit from Sir Ernest Shackleton's 1907 Nimrod expedition to Antarctica is expected to sell for £1,500 at auction later this month.

The biscuit, by makers Huntley and Palmers, sustained the men for much of the expedition, consisting of a fortified milk protein. It is unclear which expedition member brought the biscuit back from the antarctic more than a century ago, or how it came to fall into the hands of the private collector that is now auctioning it off.

The auction is being held at Christies on September 29. Below is an excerpt from the Daily Mail's report of September 16.

The importance of the round snack was even referred to by Nimrod expedition member Frank Wild who recalled how Shackleton insisted on giving him the snack.

Wild wrote that Shackleton 'privately forced upon me his one breakfast biscuit, and would have given me another tonight had I allowed him.

'I do not suppose that anyone else in the world can thoroughly realise how much generosity and sympathy was shown by this; I DO by GOD I shall never forget it.

'Thousands of pounds would not have bought that biscuit.'

Read the full Daily Mail report by clicking here.