A Cooke Troughton &amp; Simms V22 theodolite from 1960s. This example appears heavily used.
<a href="//commons.wikimedia.org/wiki/User:Colgill" title="User:Colgill">Colgill</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>