[This is apparently] a plaster model done by Henry Jackson Ellicott (1847 - 1901), which remained in the [Capitol] rotunda for quite some time. Found another photo of it in <a rel="nofollow" class="external text" href="https://books.google.com/books?id=OKq8EaomNzkC&amp;pg=PA241"><i>Thaddeus Stevens: nineteenth-century egalitarian</i> by Hans Louis Trefousse, p. 241</a>: in the rotunda in August 1868 while Thaddeus Stevens was lying in state.  <a rel="nofollow" class="external text" href="https://books.google.com/books?id=xcU8AQAAIAAJ&amp;q=%22Statue+now+in+Capitol+%28June+%2767%29+by+Ellicott%22&amp;dq=%22Statue+now+in+Capitol+%28June+%2767%29+by+Ellicott%22&amp;hl=en&amp;ei=GBZBTcPYEsGAlAeH9fwY&amp;sa=X&amp;oi=book_result&amp;ct=result&amp;resnum=1&amp;ved=0CCoQ6AEwAA"><i>Lincoln Lore,</i> Issue 874; Issue 1081</a> mentions the lying-in-state photo, and describes another <i>carte de visite</i> photo of the same statue, credited to "Rice, Union Photograph Gallery 520 Pennsylvania Ave., Washington, D. C,", labeled on the back  "Statue of President Lincoln by Ellicott", and on the front "Statue now in Capitol (June '67) by Ellicott."  That article actually claims the original photo was of Lincoln lying in state, but that was proven incorrect, as <a rel="nofollow" class="external text" href="https://books.google.com/books?id=X08TAQAAMAAJ">He belongs to the ages: the statues of Abraham Lincoln by Donald Charles Durman</a> has the Thaddeus Stevens info (and the photo I linked above appears to be the one discussed).  That book also says that newspapers of the time describe the statue as made of plaster.  That books also says the Lincoln Monument Association had a contest for a Lincoln statue, and many clay models were submitted, and speculates this was one of them. He also says all the Ellicott literature does not mention a realized statue of Lincoln, so he suspects this one was destroyed. The contest was eventually won by Lot Flannery (resulting in the statue in front of the [D.C.] City Hall, put up in April 1868). Given that there is/was another dated photo in mid-1867, I would think the 1866 date on our photo is likely correct as well. The contest was initiated shortly after Lincoln died, so it seems pretty reasonable there could have been a plaster submission by then (in San Francisco I think, a Pietro Mezzara publicly displayed a plaster statue of Lincoln in August 1865).  The painting in back is <i>Surrender of Lord Cornwallis</i>, one of the Capitol rotunda paintings. - (lightly edited from remarks by <a href="//commons.wikimedia.org/wiki/User:Clindberg" class="mw-redirect" title="User:Clindberg">User:Clindberg</a>, originally made at <a href="//commons.wikimedia.org/wiki/User_talk:Jmabel/Stereo_cards_of_Washington,_D.C." title="User talk:Jmabel/Stereo cards of Washington, D.C.">User talk:Jmabel/Stereo cards of Washington, D.C.</a>)
<bdi><a href="https://en.wikipedia.org/wiki/en:Henry_Jackson_Ellicott" class="extiw" title="w:en:Henry Jackson Ellicott"><span title="American sculptor">Henry Jackson Ellicott</span></a>
</bdi>
<p>Created: 1865-1870.
</p><p><br>
Coverage: 1865-1870.
Source Imprint: 1865?-1870?.
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Digital item published 1-25-2006; updated 2-13-2009.
This image is available from the <a href="//commons.wikimedia.org/wiki/New_York_Public_Library" title="New York Public Library">New York Public Library</a>'s Digital Library under the digital ID G90F090_019F: <a rel="nofollow" class="external text" href="http://digitalgallery.nypl.org/nypldigital/id?G90F090_019F">digitalgallery.nypl.org</a> → <a rel="nofollow" class="external text" href="https://digitalcollections.nypl.org/search/index?keywords=G90F090_019F">digitalcollections.nypl.org</a>