only find one reference to him with his full name
U.S., World War I Draft Registration Cards, 1917-1918
about Robert Sheriff Clark
Name:Robert Sheriff Clark
County:Sussex
State:New Jersey
Birth Date:14 Dec 1875
Race:White
signed in 1918
occupation gardener
next of kin Lucy Jane Clark of Lafayette NJ
not native born
not naturalized citizen
not a declared alien
BUT doesn't say where he was born and father citizen ship not given
1900 census, just married to Lucy, in the USA for 8 years so 1892 although looks like 1882 then over written 1892....but born Feb 1874
1910 United States Federal Census
about Robert S Clark
Name:Robert S Clark
Age in 1910:36
Birth Year:abt 1874
Birthplace:Scotland
Home in 1910:Independence, Warren, New Jersey
Race:White
Gender:Male
Immigration Year:1882
Relation to Head of House:Head
Marital Status:Married
Spouse's Name:Lucy J Clark
Father's Birthplace:Scotland
Mother's Birthplace:Scotland
Household Members:
Robert S Clark 36
Lucy J Clark 32 b NY, mrd 510 yrs, 5 children 5 living
Albert A Clark 9 children all born NY
Clinton S Clark 6
Robert J Clark 4
William H Clark 2
Kenneth Clark 0[1/12]
Herbert V Odell 22 br in law, b NY
Nancy Odell 62 mother in law, widow, 4 children 4 living, b NY
1920 census, immigrated 1895
Robert S Clark 43 widow, machinist zinc mine
Clinton S Clark 16
R James Clark 15[13]
William V Clark 11
Kenneth Clark 9
J Alden Clark 8
Clifford Clark 6
Lucy J Clark 4[4 4/12]
Dorothy M Clark 2[2 8/12]
1930 census also says 1895 as immigration date
immigration date would vary if he gave his date of entering USA (1895)and not the date he left Scotland (1882?)
will be hard to pinpoint him as Robert Clark not exactly unique.
his marriage record may give his parents name.