The family history of this weapon is not known. All I do know is that it's been passed down through the family for generations and I do have a relative that was with the Iowa Volunteers and with Sherman in his March to the Sea, but it's a shame that we can't trace how this weapon came around.
A quick search of the Iowa Civil War records found these soldiers with the name "Saint".
12th Iowa Infantry, Company A
Saint, Richard. Age 23. Residence Union, nativity Indiana. Enlisted Sept. 14, 1861. Mustered
Oct. 17, 1861. Deserted Aug. 16, 1862, Camp Montgomery, near Corinth, Miss
14th Iowa Infantry Company I
Saint, Henry. Age 21. Residence Salem, nativity Indiana. Enlisted Nov. 5, 1861. Mustered Nov.
5, 1861. Missing in action April 6, 1862, Shiloh, Tenn. Paroled May 24, 1862, Macon, Ga.
Mustered out Nov. 16, 1864, Davenport, Iowa.
23rd Iowa Infantry Company I
Saint, James. Age 31. Residence Lewis, nativity Ohio. Enlisted Aug. 12, 1862, as Second
Corporal. Mustered Aug. 28 1862. Promoted First Corporal Feb. 7, 1863; Fifth Sergeant April 1
1863, Second Sergeant Sept. 1, 1863. Mustered out July 26, 1865, Harrisburg, Texas.
4th Iowa Cavalry Company C
Saint, George W. (Veteran.) Age 22. Residence Salem, nativity Indiana. Enlisted Oct. 5, 1861,
as Fifth Corporal. Mustered Nov. 25, 1861. Promoted Fourth Corporal Feb. l, 1862; Third
Corporal Feb. 25, 1862; Second Corporal Sept. 1, 1862; First Corporal June 10, 1863. Reenlisted
and re-mustered Dec. 30, 1863. Wounded severely June 10, 1864, Guntown, Miss
Discharged for wounds Oct. 22, 1864, Benton Barracks, (St. Louis,) Mo.
4th Iowa Cavalry Company E
Saint, Exum R. (Veteran.) Age 22. Residence Grinnell, nativity Indiana. Enlisted Sept. 14,
1861, as First Sergeant. Mustered Nov. 23, 1861. Promoted Second Lieutenant June 24, 1862;
First Lieutenant Aug. 10, 1862; Captain Nov. 26, 1864 Mustered out Aug. 8, 1865, Atlanta, Ga.
5th Iowa Cavalry-Unassigned Recruit
SaintCleer, Timothy. Age 29. Residences Marion County, nativity Ireland. Enlisted Dec. 1,
1864. Mustered Dec. 2, 1864. No further record.