Pierre-Joseph-Olivier Chauveau's signature.
Traced in Adobe Illustrator from https://books.google.ca/books?id=BQUFAAAAYAAJ&amp;pg=PA200&amp;lpg=PA200&amp;dq=Pierre-Joseph-Olivier+Chauveau+portrait+gallery&amp;source=bl&amp;ots=IUigYAQ3H_&amp;sig=PCO2DwXNN7hsc8QMlKU8z5E_XoI&amp;hl=en&amp;ei=h2D_So_ODJLTnge52MSOCw&amp;sa=X&amp;oi=book_result&amp;ct=result&amp;resnum=1&amp;ved=0CAgQ6AEwAA#v=onepage&amp;q=&amp;f=false
Pierre-Joseph-Olivier Chauveau