Angels with nails and a timber (symbols of passion), Parts of the back wall of an altar or antependium
<div class="fn value">
<a href="//commons.wikimedia.org/wiki/Category:Giovanni_di_Antonio_Buora" title="Category:Giovanni di Antonio Buora">Giovanni di Antonio Buora</a> attributed</div>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>