Focus stack of a vintage Minerva stopwatch. The dirt and dust is all inside the watch so cleaning wasn't possible. I apologize for that. Focus stack of 25 pictures with Helicon Focus.
<a href="//commons.wikimedia.org/wiki/User:Code" title="User:Code">Ansgar Koreng</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>