Green, blue and yellow, central four-leaf clover.
<div class="fn value">
Unknown artist<span style="display: none;">Unknown artist</span></div>
1880–90
<a rel="nofollow" class="external text" href="https://collection.cooperhewitt.org/objects/18423215">Catalog</a> <a rel="nofollow" class="external text" href="https://images.collection.cooperhewitt.org/46125_c1a921310629e763_x.jpg">Photo</a>