Watches have a rich history and fascinating design features.

1. The oldest known mechanical watch: The oldest known mechanical watch dates back to the 16th century. It was created by the German locksmith and watchmaker Peter Henlein around 1505.

2. The world's first wristwatch: The world's first wristwatch was designed and created by Abraham-Louis Breguet for Caroline Murat, Queen of Naples, in 1810. It was a groundbreaking innovation at the time as most watches were pocket watches.

3. The term "chronometer": The term "chronometer" refers to a watch that has been tested and certified for accuracy by an official authority. It was coined by English clockmaker Jeremy Thacker in 1714.

4. World's most expensive watch: As of my last update in September 2021, the Patek Philippe Grandmaster Chime Ref. 6300A was the most expensive watch ever sold. It was auctioned for over $31 million in 2019. However, the title of the most expensive watch might have changed since then.

5. Quartz revolution: The introduction of quartz technology in the 1970s revolutionized the watch industry. Quartz watches use a battery-powered quartz crystal oscillator to regulate time, making them more accurate and affordable than traditional mechanical watches.

6. Space exploration and watches: Omega Speedmaster Professional became the first watch worn on the moon during the Apollo 11 mission in 1969. NASA approved it after rigorous testing and it has since earned the nickname "Moonwatch."

7. The smallest mechanical watch: Swiss watch manufacturer Jaeger-LeCoultre holds the record for creating the world's smallest mechanical watch. It measures just 18.4 mm x 4.9 mm x 3.4 mm.

8. Watch complications: Complications are additional features in a watch beyond its standard timekeeping function. Some impressive complications include tourbillons (to counteract the effects of gravity on accuracy), perpetual calendars (to display the correct date including leap years), and minute repeaters (to chime the time).

9. Horology: The art and science of making watches and clocks is known as horology. It's a field that combines engineering, craftsmanship, and precision.

10. The most popular wristwatch brand: Rolex is one of the most recognizable and popular luxury watch brands in the world. Founded in 1905, Rolex has been associated with precision, durability, and status.

11. Diving watches: Rolex Submariner, introduced in 1953, was one of the first diving watches. It became iconic for its water resistance and rotating bezel used to track diving time.

12. Smartwatches: The first true smartwatch was the IBM Simon Personal Communicator, introduced in 1994. However, the modern smartwatch era was revolutionized with the introduction of the Apple Watch in 2015.

Watches continue to evolve with technological advancements, but they remain a symbol of craftsmanship, style, and precision.