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.
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I use Blender 3D to create these models. It's free and open source, and the community is amazing:
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