Signature of <a href="https://en.wikipedia.org/wiki/Sergei_Prokofiev" class="extiw" title="w:Sergei Prokofiev">Sergei Prokofiev</a>
Signature: Sergei Sergejewitsch Prokofjew
Unknown date<div style="display: none;">Unknown date</div>
<a rel="nofollow" class="external free" href="http://altarpiece.blogspot.com/2010/05/musical-signatures.html">http://altarpiece.blogspot.com/2010/05/musical-signatures.html</a>