| Regimental number | 4912 |
| Other Names | Herbert Wiliam |
| Religion | Roman Catholic |
| Occupation | Builder |
| Address | 114 Elizabeth Street, Launceston, Tasmania |
| Marital status | Married |
| Age at embarkation | 25 |
| Next of kin | Wife, Mrs G Duffy, 114 Elizabeth Street, Launceston, Tasmania |
| Enlistment date | 18 November 1915 |
| Rank on enlistment | Private |
| Unit name | 12th Battalion, 15th Reinforcement |
| AWM Embarkation Roll number | 23/29/4 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A70 Ballarat on 18 February 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 12th Battalion |
| Fate | Died of wounds 22 November 1916 |
| Family/military connections | Brother: 3719 Pte Robert James DUFFEY, 1st Bn, killed in action, 19 August 1916. |