The only surviving authenticated portrait of <a href="https://en.wikipedia.org/wiki/Billy_the_Kid" class="extiw" title="en:Billy the Kid">Billy the Kid</a>.  This <a href="https://en.wikipedia.org/wiki/tintype" class="extiw" title="en:tintype">tintype</a> portrait sold at auction in June 2011 for USD $2,300,000 to <a href="https://en.wikipedia.org/wiki/Bill_Koch_(businessman)" class="extiw" title="en:Bill Koch (businessman)">William Koch</a>. Detailed description <a rel="nofollow" class="external text" href="http://www.denveroldwest.com/ow-billytk.html">here</a>
<bdi><a href="https://en.wikipedia.org/wiki/en:Ben_Wittick" class="extiw" title="w:en:Ben Wittick"><span title="American photographer">Ben Wittick</span></a>
</bdi>
<a href="//commons.wikimedia.org/wiki/File:Billy_the_Kid_tintype,_Fort_Sumner,_1879-80-Edit2.jpg" title="File:Billy the Kid tintype, Fort Sumner, 1879-80-Edit2.jpg">File:Billy the Kid tintype, Fort Sumner, 1879-80-Edit2.jpg</a>