Hello Dan,
I hae to disagree with your characterization of what naturalizatization of the Jews of Posen meant. Jeish citizens did not have all the rights of other citizens in that under the 1833 Decree they could not hold public office and could not vote for members of Parliament. Full rights did not come until the fall of the Empire in 1918. Please make changes in your characterization accordingly.
Thank you.
Edward Luft