Measuring just 1.65mm, the aptly named ThinKing is a quirky watchmaking marvel inspired partly by an ultra-thin watch made 200 years earlier. Who can make the world’s thinnest mechanical watch?

Bulgari has unveiled the Octo Finissimo Ultra, the world’s thinnest watch to date, and the world’s thinnest chronometer-certified watch. Limited to 20 pieces, the Bulgari Octo Finissimo Ultra ...