German regional gazetteers and Wikipedia articles for Prussian-era and present-day localities · Meyers Gazetteer; GOV/genealogy.net; AGOFF; Wikipedia (de/en)
Altstadt, Mohrungen, Königsberg, Preussen
Meyers Gazetteer entry 'Altstadt 4) Kr. Mohrungen'. de.wikipedia 'Kreis Mohrungen' lists the Kirchspiel and Amtsbezirk Proekelwitz village Altstadt as Stare Miasto (Stary Dzierzgon); pl.wikipedia 'Stare Miasto (wojewodztwo pomorskie)' gives 53.886667, 19.365556.