The cookie, made specifically for the Nimrod Expedition (1907-1909), is a Huntley & Palmers biscuit that measures 3 inches (7.7 cm.) in diameter and is fortified with milk protein. No word on how it tastes -- stale, presumably -- after all these years.
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The sale price was £250 (~$390) short of the highest estimate. Perhaps, not many people want a century-old cookie.