Augsberg records:

These all may be part of the Jakob Family

record title: Germany Births and Baptisms, 1558-1898 
name: Anna Katharina Koberstein 
gender: Female 
baptism/christening date: 02 Dec 1891 
baptism/christening place: Sankt Pankratius , Lechhausen (Augsburg), Bayern, Germany 
birth date: 29 Nov 1891 
birthplace: Augsberg, Bayern, Germany 
father's name: Georg Koberstein 
mother's name: Anna Kröner 
indexing project (batch) number: C02468-3 
system origin: Germany-EASy 
source film number: 573688 

record title: Germany Births and Baptisms, 1558-1898 
name: Ferdinand Koberstein 
gender: Male 
baptism/christening date: 24 Sep 1893 
baptism/christening place: Sankt Pankratius , Lechhausen (Augsburg), Bayern, Germany 
birth date: 19 Sep 1893 
birthplace: Augsberg, Bayern, Germany 
father's name: Georg Koberstein 
mother's name: Anna Kräner 
indexing project (batch) number: C02468-3 
system origin: Germany-EASy
source film number: 573688  

birth: 1894 
death: 03 Jun 1894 — Augsburg, Bayern, Germany
record title: Germany Deaths and Burials, 1582-1958 
name: Johann Adam Koberstein 
gender: Male 
death date: 03 Jun 1894 
death place: Augsburg, Bayern, Germany 
age: 0 
birth date: 1894 
indexing project (batch) number: B03708-4 
system origin: Germany-EASy 
source film number: 573691 

death: 19 Jan 1913 — Augsbury, Bayern, Germany 
parents: Wilhelmine
record title: Germany Deaths and Burials, 1582-1958 
name: Margareta Koberstein 
gender: Female 
death date: 19 Jan 1913 
death place: Augsbury, Bayern, Germany 
mother's name: Wilhelmine 
indexing project (batch) number: B03229-4 
system origin: Germany-EASy 
source film number: 580369 

birth: 28 Nov 1919 
death: 11 Feb 1920 — Augsburg, Bayern, Germany
record title: Germany Deaths and Burials, 1582-1958 
name: Wilhelmina Koberstein 
gender: Female 
death date: 11 Feb 1920 
death place: Augsburg, Bayern, Germany 
birth date: 28 Nov 1919 
father's name: Ferdinand Koberstein 
indexing project (batch) number: B03782-7 
system origin: Germany-EASy 
source film number: 580373 

All Bavaria, Germany, WWI Personnel Rosters, 1914-1918 results for Koberstein

Friedrich Koberstein (born March 8, 1892) who was single with parents: Wilhelm Koberstein and ? nee  Kellerer.

Ferdinand Koberstein (born September 19, 1893) who was single with parents: Georg Koberstein and Anna Koberstein

Franz Georg Koberstein (born January 18, 1898) who was single with parents: Wilhelm Koberstein and ? Koberstein.

Johann Koberstein (born January 15, 1898 in Lechhausen near Augsburg) who was single with parents: Georg Koberstein and ? nee Kramer?