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>.
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unattributed, possibly a traveling photographer who came through Fort Sumner in 1880. <a rel="nofollow" class="external autonumber" href="http://www.denveroldwest.com/ow-billytk.html">[1]</a></div>
Brian Lebel's Old West Show and Auction