| Regimental number | 6743 |
| Place of birth | Wandearah West, South Australia |
| School | Public School, South Australia |
| Religion | Methodist |
| Occupation | Clerk |
| Address | Crystal Brook, South Australia |
| Marital status | Single |
| Age at embarkation | 20.9 |
| Height | 5' 9" |
| Weight | 150 lbs |
| Next of kin | Mother, Mrs E W Estick, Crystal Brook, South Australia |
| Previous military service | Served for 2.5 years in the 24th Australian Light Horse, Citizen Military Forces. |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Port Pirie, South Australia |
| Rank on enlistment | Private |
| Unit name | 10th Battalion, 22nd Reinforcement |
| AWM Embarkation Roll number | 23/27/4 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A19 Afric on |
| Rank from Nominal Roll | Lance Corporal |
| Unit from Nominal Roll | 10th Battalion |
| Fate | Killed in Action |
| Place of death or wounding | France |
| Age at death | 23 |
| Place of burial | La Kreule Military Cemetery (Plot I, Row D, Grave No. 4), Hazebrouck, France |
| Panel number, Roll of Honour, Australian War Memorial | 59 |
| Miscellaneous information from cemetery records | Parents: Charles John and Elizabeth Wells ESTICK, Crystal Brook, South Australia. Native of Wandearah West, South Australia |
| Family/military connections | Brother: 39069 Driver Gilbert Victor ESTICK, 3rd Field Artillery Brigade, returned to Australia, 20 June 1919. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, ESTICK Sydney William |