Aus Russland marking on Russian mail - type Ry11. Russian mail on transit through the German Empire via the <a href="https://en.wikipedia.org/wiki/Prussian_Eastern_Railway" class="extiw" title="w:Prussian Eastern Railway">Prussian Eastern Railway</a> (<i>Eisenbahnpost Bureau XI</i>) south route, 'AUS RUSSLAND ÜBER BUR. XI EDK.BRG / PORTO 10 9 II 66' red double circle postmark applied, type Ry11. EDK.BRG meaning <a href="https://en.wikipedia.org/wiki/Chernyshevskoye" class="extiw" title="w:Chernyshevskoye">Eydtkuhnen</a>-<a href="https://en.wikipedia.org/wiki/Bydgoszcz" class="extiw" title="w:Bydgoszcz">Bromberg</a>, at Eydtkuhnen it reached the German Empire's border with the Russian Empire.
Prussian post
1866-09-10
Self-scanned