Drawing of a seal used by Thomas Mifflin as the President of the Continental Congress in 1783-4, which is a derivative of the <a href="https://en.wikipedia.org/wiki/Great_Seal_of_the_United_States" class="extiw" title="w:Great Seal of the United States">Great Seal of the United States</a>.  It is possible the seal was used by all Presidents of the Congress, but the seal apparently did not pass over to the federal government in 1789.  The drawing was made in about 1885; it is not known if the artist (David McNeely Stauffer) worked from an actual wax impression or earlier printed versions.
David McNeely Stauffer (1845-1913)<a rel="nofollow" class="external autonumber" href="http://library.fandm.edu/archives/mscoll/stauffer.html">[1]</a>
circa 1885 <div style="display: none;">date QS:P,+1885-00-00T00:00:00Z/9,P1480,Q5727902</div>
Scanned from page 565 of <i>The Eagle and the Shield</i> by Richard Patterson and Richardson Dougall, 1978.  In turn taken from the New York Public Library's <i>Calendar of the Emmet Collection of Manuscripts, etc., Relating to American History</i>, on page 85.