Stamp of Prussia, 1 Silbergroschen issue 1861, blue cancelled at GARTOW, Hanover type.
<a href="//commons.wikimedia.org/wiki/User:Jacquesverlaeken" title="User:Jacquesverlaeken">Jacquesverlaeken</a>
2013-08-22
<span class="int-own-work" lang="en">Own work</span>