Stamp of Greece, 25 Lepta issue 1911, model for the ultramarine colour in Yvert Catalog.
<a href="//commons.wikimedia.org/wiki/User:Jacquesverlaeken" title="User:Jacquesverlaeken">Jacquesverlaeken</a>
2014-03-28 23:54:26
<span class="int-own-work" lang="en">Own work</span>