The watch and art worlds come ever closer as horological auctions continue to achieve phenomenal sales and results. But 2014 is particularly significant as the most complicated timepiece ever made - the Patek Philippe Henry Graves Supercomplication - has been presented at auction for the second time in 15 years. Commissioned by the American banking tycoon in 1928, it fetched $24m at Sotheby's Geneva last week - over double the amount of its previous sale value of $11m.

The closing months of the year are the most anticipated for vintage watch connoisseurs. Not only do the big sales take place in Geneva and New York, collectors can get a good idea of whether recent purchases have been good ones. Antiquorum, a key player in modern and vintage watch sales, with offices in Geneva, New York, and Hong Kong staged their auction of 1000 'Important Modern & Vintage Timepieces' at the Mandarin Oriental Geneva last week, with sales totalling nearly CHF 13 million. The results are a good indicator of the pieces you might want to consider investing in next.