Teams from the Federation of the Swiss Watch Industry ranged the aisles of the Hong Kong Watch & Clock Fair to track down counterfeiters and unauthorised users of the "Swiss" indication of origin, with positive results.

Following the introduction of its Superlative Chronometer label, Rolex has integrated a fully automated test protocol into its production line.

With the balance spring now ensconced in their movements, watchmakers were able to consider a more precise subdivision of time for their pocket watches, hence the advent of the minute hand circa 1700. The race for precision was a serious business that would force watchmakers to imagine new escapements and new balance springs to go with them.

In 2015, Rolex introduced a new standard of precision with a tolerance of -2/+2 seconds per day. In order to measure this precision, it had to first look at how its watches are worn. A task it has approached with characteristic thoroughness.

For the past four decades, the Nautilus has epitomised casual elegance, a milestone Patek Philippe has chosen to mark with two limited editions. What better way for the brand to wish its many admirers and collectors a happy anniversary.