BBC News - The story of the 'most complicated' watch in the world

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The most complicated handmade watch, the Henry Graves Supercomplication, is to be auctioned with an estimate of 9.8m, writes Luke Jones.

A "complication" is a technical term referring to any feature on a watch which is in addition to simply telling the time - and Henry Graves Jr wanted more than anyone else.

The Supercomplication, made by Patek Philippe in 1932, has 24 of them including Westminster chimes, a perpetual calendar, sunrise and sunset times, and a celestial map of New York as seen from Graves's apartment on Fifth Avenue.
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