A review of sociological and historical research into long-term social mobility shows a common research agenda linking total mobility, relative mobility, and stratification to industrialization, as well as powerful methods to test hypotheses on widely available historical data. To demonstrate the viability of such a historical approach, social mobility and stratification in Berlin between 1825 and 1957 are analyzed. Intergenerational as well as marital total mobility rates show no correlation with industrialization. However, with respect to relative intergenerational mobility, the Berlin data corroborate the hypothesis of a gradual growth in 'openness' more than the hypotheses of no change, or of a one-time increase during early industrialization. For marital mobility no trend in relative mobility is evident.