Autograph manuscript of Variatio I, Canonic Variations, BWV 769a, P 271.
J.S.Bach
<a rel="nofollow" class="external text" href="https://www.bach-digital.de/rsc/viewer/BachDigitalSource_derivate_00000107/db_bachp0271_page100.jpg">Digitised image</a>, Bach Digital Archive, Leipzig