This is an envelope from one of the letters sent to Rika (Knaack) Heiden (left) i.e. Mrs August Heiden, in the 1920s from relatives in Rostock, Germany. In light of today's postal regulations, it is interesting that letters addressed like this actually got delivered to the correct people.

The word Maurer is German for brick layer which was August Heiden's trade when they came from Germany.

The back of the envelope includes the Schafhausen who was Marie (Schmidt, Schafhousen) Dohmstritch, the daughter of August's half-sister, Fredericka Schmidt.