The first Patek Philippe Ref. 5073P to be offered for public sale has seen top bids in Sotheby's Important Watches auction, held on October 8 in Hong Kong.

Few examples of Ref. 5073P were made due to its complexity and cost

The watch is similar to the top-selling Ref. 2074, yet is available only in platinum with a black baguette diamond-set dial. It sold for $747,794 - a 12.5% increase over high estimate.

The bezel and shoulders are set with 103 baguette diamonds, with a matching diamond set folding buckle that features a further 42 baguette diamonds.

Created in 2011, the watch boasts a minute repeater and cathedral gongs with Moon phases and leap year indication, as well as a perpetual calendar. With creating such a complicated watch in a platinum case both time consuming and labour intensive, very few examples of Ref. 5073P were made.

Unique pieces from Patek Philippe are reserved for the most prestigious clients, and are snapped up at auction

Also featuring was a striking clock watch from Patek Philippe, uniquely commissioned by one of its top customers, which sold for $670,436.

Featuring enamel portraits of the vendor's children by G Menni, one of the world's foremost enamel artists, the watch is an incredible display piece, providing a rare opportunity for collectors to own a unique Patek Philippe piece on the secondary market.

Greubel Forsey is one of the most innovative watch brands, constantly inventing and improving

While the sale was dominated by Patek Philippe, a Greubel Forsey Tourbillon 24 Seconds Contemporain "Royal Blue" also appeared in the top lots, selling at $306,853.

The watch was created in 2012 to showcase the company's 24-second tourbillon, with a titanium movement and transparent sapphire tourbillon bridge placed to provide a 3D view of its workings.

Paul Fraser Collectibles has a superb Longines Olympic men's watch for sale.