Peter Grützmacher, a single craftsman (Handwerker), settled in the Volga German colony of Rosenheim on 27 July 1765. He is recorded there on the 1767 census in Household No. 23.
The 1767 census records that Peter Grützmacher came from the German region of Hamburg.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 67.