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.
Peter Kreutzmacher and his wife are recorded on the 1798 census of Rosenheim in Household No. Rm57. They do not appear to have any surviving male descendants.
The 1767 census records that Peter Grützmacher came from the German region of Hamburg.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Rm57.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 67.