Mechanical watches have no battery, microchip, or circuitry. Watch parts are machined to near perfection at microscopic sizes and tolerances and can produce accuracy within two to three seconds per day. Get on Patreon and help fund my 3D animation obsession! It wouldn't feel right to put sponsorship segments in the middle of high quality educational content, so let's try another way together: https://www.patreon.com/animagraffs Need 3D illustration and animation? Have suggestions for what to explain next? Animagraffs can help! Let's chat: https://animagraffs.com/contact/ License Animagraffs work for your own purposes https://animagraffs.com/licensing/ Buy the incredible "Inside a Mechanical Watch" poster (various sizes offered) to support Animagraffs! https://www.etsy.com/listing/926751534/ See more explanations of how things work at: https://animagraffs.com/ I use Blender 3D to create these models. It's free and open source, and the community is amazing: https://www.blender.org/ Chapters 0:00 Intro 0:44 Crown 1:36 Mainspring 2:14 Wheel Train 2:57 Jewel Bearings 3:11 Motion Works 4:10 Escapement & Balance Wheel 6:38 Supporting Structure