Hi,
I believe "Abstammungsnachweis is a very new thing recently invented. (1970)
"Geburtsurkunde", birth-certificate has been replaced bei
Abstammungsnachweis.
The Arier-Ausweis showed only 3 or 4 generations of the father's as well as
the mother's side, and all Germans had to fill it out and have it signed by
the police, town-mayor etc.
There also existed a small Ahnenpaß for 15 couples and a big version
-book-like - for 150 couples, always showing birth, marriage and death of husband
and wife.This was voluntary.
Those who still have the big version of that Ahnenpaß have been spared a lot
of while looking for their ancesters.
Ulla