One of the world’s most sought-after luxury assets has seen a surge in second-hand sales in recent years. The luxury watch market is unique in terms of its investment opportunity: huge monetary returns are highly unlikely and expensive timepieces often depreciate in value. That’s not to say that an investment isn’t worthwhile, though. In April 2017, the Sotheby’s Watches auction in London achieved a stunning grand total of £2,258,000. The highest achiever of the night...