Poland Seal of the fortress Graudenz/Grudziądz (1919-1939)

[saxcob]

Inscription: "Szefostwo Fortyfikacji Grudziądz".

The city/fortress was German/Prussian pre 1919 when it became Polish. During the Napoleonic invasion in Prussia in 1806/07, the fortress was successfully defended by General Wilhelm René de l'Homme de Courbière against attacks by French troops.

Here is a picture of German troops taking the city in September 1939:

http://www.bridgemanart.com/en-GB/asset/348037/german-photographer-20th-century/civilians-greet-german-soldiers-on-their-entry-into-graudenz-4th-september-1939-b-w-photo