The balance wheel, pallet fork, escapement wheel, and a few of the gears of a Chinese movement in a skeleton watch, as seen in <a href="//commons.wikimedia.org/wiki/File:Automatic_skeleton_watch.jpg" title="File:Automatic skeleton watch.jpg">File:Automatic skeleton watch.jpg</a>.
<a href="//commons.wikimedia.org/wiki/User:Hustvedt" title="User:Hustvedt">Hustvedt</a>
<span class="int-own-work" lang="en">Own work</span>