Basal disc placed by <a href="https://en.wikipedia.org/wiki/John_Doubleday_(restorer)" class="extiw" title="w:John Doubleday (restorer)">John Doubleday</a> on the <a href="https://en.wikipedia.org/wiki/Portland_Vase" class="extiw" title="w:Portland Vase">Portland Vase</a> after his 1845 reconstruction. It reads: Broke Feby 7th 1845/Restored Sept 10th 1845/By John Doubleday".
British Museum
<a rel="nofollow" class="external text" href="http://www.britishmuseum.org/research/collection_online/collection_object_details/collection_image_gallery.aspx?partid=1&amp;assetid=367175001&amp;objectid=466297">British Museum</a> (mislabeled as part of the Auldjo Jug)