First, let me apologize for writing in English, you may answer in any language. I will understand.
I'm looking for my grandfather birth certificate, but i'm not sure where to look.
My grand father was born in 1913 in Pamiontkowo which was a village in the province of Posen.
In 1913 this village was still German, not long after in 1918-1919 it switched hands and became apart of Poland under the polish corridor.
If anyone knows to which Standesamt I need to write to, to look for this information I will be honestly grateful.