According to Bates (1), and the list of non-commissioned officers (3), his middle initial is S Griffith. I'm not sure what letter the company E descriptive roll (2) has, but I think it is a "C".
He was 40 years old when he enlisted (2, 15 [74 at death in 1890], 16 [62 in 1880], 17 [53 in 1870]). He was born in Philadelphia, Pennsylvania (2, 15, 16, 17).
In 1860, he was living in the first ward of Philadelphia, Pennsylvania (12). He was a hotel keeper, and owned $300 in personal property (12). He was living with Rebecca (presumably his wife), with John, Samuel, Anne, Sarah, Rebecca, and William (presumably their children), and with William McIlvain, Lewis Brophey, and Charles Davis (12).
When he enlisted, he was a vender (2).
He was 5 feet 7-1/2 inches tall, had a light complexion, blue eyes, and dark hair (2).
He enlisted and was mustered into service on 20 August 1861 at Philadelphia, Pennsylvania, as a sergeant in company E (1, 2, 9). He was enlisted by Captain Lentz, and mustered into service by Colonel Reiff (2). He was appointed sergeant on 10 September 1861 (3).
He seems to have had a son Samuel Griffiths, who was badly injured in an explosion in an ammunition factory in March 1862 (13).
Starting 10 February 1863, he was absent on furlough for ten days (6). On 21 February 1863, he had returned (7).
He fought, as a sergeant, in the battle of Gettysburg (5).
On 2 September 1863, he had returned to the regiment from hospital (8).
He mustered out on 1 September 1864 when his term expired, at Weldon Railroad, Virginia (1, 2, 3, 4 [9 September], 9, 11).
In 1870, he was living in Philadelphia, Pennsylvania (17). He was living with his wife Rebecca and children Rebecca and Emma (17). He was a butcher, and owned $6,000 in real estate and $500 in personal property (17).
In 1880, he was living at 1149 South 15th Street, Philadelphia, Pennsylvania (16). He was living with his wife Rebecca, and children Rebecca and Emma (16). He was in the livery business (16).
On 26 February 1890, he died, of capillary bronchitis (15). He died at, or was buried from, 1515 Federal Street, Philadelphia, Pennsylvania (15). He was buried in Woodlands Cemetery, on 3 March 1890 (15).
In 1890, his widow, Rebecca Griffith, was living in Philadelphia Pennsylvania (9).
On 27 September 1890, his widow, Rebecca Griffith, applied successfully from Pennsylvania for a pension (10, 14).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster)
2 company E descriptive roll, number 5 (Samuel C [?] Griffith)
3 list of non-commissioned officers, company E
4 company E, register of men discharged, number 20 (Samuel S Griffith)
5 Pennsylvania Memorial, 91st Pennsylvania plaque, Gettysburg, Pennsylvania (Samuel S Griffith)
6 consolidated morning report, 10 February 1863
7 consolidated morning report, 21 February 1863 (Sergt Griffith)
8 consolidated morning report, 91st PA, 2 September 1863 (Sergt Griffith)
9 1890 US Census, veterans' schedule, Pennsylvania, Philadelphia, supervisor's district 1, enumeration district 582, page 2 (image 1896 on <www.ancestry.com>) (Samuel Griffith)
10 pension index, by name (Samuel S Griffith)
11 consolidated morning report, 91st Pennsylvania, 10 September 1864 (Sergt Griffith)
12 1860 US census, Pennsylvania, Philadelphia, ward 1, microfilm series M653, film 1151, page 445 = 185 handwritten (Samuel Griffith)
13 'City affairs'. North American and United States Gazette (Philadelphia PA) 2 April 1862 (son Samuel Griffiths)
14 pension index, by regiment, 91st PA Infantry, company E (Samuel S Griffiths)
15 death certificate, Philadelphia, Pennsylvania, Samuel S Griffith, 26 (?) February 1890 (Samuel S Griffith)
16 1880 US census, Pennsylvania, Philadelphia, supervisor's district 1, enumeration district 553, microfilm series T9, film 1185, page 552 = 8 D handwritten (Saml S Griffith)
17 1870 US census, Pennsylvania, Philadelphia, microfilm series M593, film 1413, page 284 = 43 handwritten (Samuel S Griffith)
| line | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Dwelling number | 1319 | ||||||||||
| Family number | 1510 | ||||||||||
| Name | Samuel Griffith | Rebecca " | John " | Samuel " | Anne " | Sarah " | Rebecca " | William " | William McIlvain | Lewis Brophey | Charles Davis |
| Age | 42 | 35 | 20 | 17 [could be 14 or 19] | 13 | 11 | 3 | 1 | 50 | 28 | 15 |
| Sex | m | f | m | m | f | f | f | m | m | m | m |
| Color | |||||||||||
| Occupation | hotel keeper | Butcher | " " | Iron moulder | " | Butcher | |||||
| Value of real estate owned | |||||||||||
| Value of personal estate | 300 | ||||||||||
| Place of birth | Penn | " | " | " | " | " | " | " | Ireland | Penn | N Jersey |
| Married within year | |||||||||||
| Attended school within year | 1 | 1 | |||||||||
| Cannot read & write | |||||||||||
| Deaf, dumb, blind, etc. |
| line | 11 | 12 | 13 | 14 |
| Dwelling-house number | 286 | |||
| Family number | 316 | |||
| Name | Griffith Samuel S | - Rebecca | - Rebecca | - Emma |
| Age | 53 | 45 | 14 | 9 |
| Sex | M | F | F | F |
| Color | W | W | W | W |
| Occupation | Butcher | Keeping house | Attending school | Attending school |
| Real estate value | $6000 | |||
| Personal estate value | $500 | |||
| Birthplace | Pennsylvania | Pennsylvania | Pennsylvania | Pennsylvania |
| Father foreign born | ||||
| Mother foreign born | ||||
| Birth month if born within year | ||||
| Marriage month if married within year | ||||
| Attended school past year | 1 | 1 | ||
| Can't read | ||||
| Can't write | ||||
| Deaf, dumb, blind, etc. | ||||
| Male US citizen at least 21 years old | 1 | |||
| Male US citizen at least 21 years old who can't vote ... |
| line | 31 | 32 | 33 | 34 |
| street name | South 15th | |||
| house number | 1149 | |||
| dwelling visit # | 65 | |||
| family visit # | 65 | |||
| name | Griffith Saml S. | " " Rebecca | " " Rebecca | " " Emma |
| color | W | W | W | W |
| sex | M | F | F | F |
| age | 62 | 54 | 22 | 18 |
| month born if born in year | ||||
| relationship | Wife | Daughter | Daughter | |
| single | 1 | 1 | ||
| married | 1 | 1 | ||
| widowed/divorced | ||||
| married during year | ||||
| occupation | Livery Buisness [sic] | |||
| months unemployed | ||||
| currently ill? | ||||
| blind | ||||
| deaf/dumb | ||||
| idiotic | ||||
| insane | ||||
| disabled | ||||
| school this year | ||||
| can't read | ||||
| can't write | ||||
| birthplace | Penna | Penna | Penna | Penna |
| father's birthplace | Wales | English [sic] | Penna | Penna |
| mother's birthplace | Wales | Penna | Penna | Penna |