The Escapement Almost Every Watch Still Uses

Open the back of most mechanical watches and you'll find the same small mechanism doing the same job it has done for two centuries: a forked lever that catches a tooth of the escape wheel, holds it, then lets it go. That push-and-release, repeated several times a second, is what makes a watch tick, and what lets its gears turn a steady, measured amount rather than spinning freely.

It's called the Swiss lever escapement, but the name is misleading. It was invented in London, not Geneva, by the watchmaker Thomas Mudge, around 1755.

What Switzerland contributed was scale and refinement. Geneva workshops of the 1830s, aided by machines that could cut identical parts for identical watches, took Mudge's design and made it the industry standard: reliable, repairable, and eventually nearly universal. By around 1900 it was in virtually every mechanical watch made.

So "Swiss lever" describes where the escapement was perfected and mass-produced, not where the idea began. The watch on your wrist, if it's mechanical, is very likely ticking to an Englishman's idea, built to a Swiss standard.