From Stamps of the World
Międzychód is a town (10,915 inhabitants in 2009) in Greater Poland Voivodeship, the administrative seat of Międzychód County. BIRNBAUM was a Kreis capital, District of Posen when in Prussian Posen province (before 1870).
Postmarks in Empire of Germany Posen province
Postmarks in Prussia Posen province
It used a postal code 132.