| Regimental number | 188 |
| Place of birth | Guy Fawkes New South Wales |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Tyringham, Armidale, New South Wales |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Father, W J Sinclair, Tyringham, Armidale, New South Wales |
| Enlistment date | 7 December 1915 |
| Rank on enlistment | Corporal |
| Unit name | 33rd Battalion, A Company |
| AWM Embarkation Roll number | 23/50/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A74 Marathon on 4 May 1916 |
| Rank from Nominal Roll | Sergeant |
| Unit from Nominal Roll | 33rd Battalion |
| Fate | Returned to Australia 12 June 1919 |
| Family/military connections | Brothers: No.3912 Lieutenant Raymond Sinclair, MM, DCM, 4th Battalion; No.2476 Sergeant Clarence Frederick Clarence, 19th Battalion, who was killed in action on 11 August 1918 and Lieutenant [..ale] Sinclair, Australian Flying Corps, Egypt. |
