First invented in the 1920s, the self-winding wristwatch was a triumph of engineering, but, like any new technology, it could be finicky. Fortunately, speed bumps breed innovation.

This 40mm watch is now the thinnest self-winding timepiece on the market, at just 5.15mm thick. Bulgari Octo Finissimo Automatic A new in-house manufacture movement had to be created – the ...