| Regimental number | 1909 |
| Place of birth | Charlton, Victoria |
| Religion | Presbyterian |
| Occupation | Farmer |
| Address | Wood Wood via Swan Hill, Victoria |
| Marital status | Single |
| Age at embarkation | 25 |
| Height | 5' 8" |
| Weight | 152 lbs |
| Next of kin | Father, Alexander Sinclair, Wood Wood via Swan Hill, Victoria |
| Previous military service | Nil |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Seymour, Victoria |
| Rank on enlistment | Private |
| Unit name | 13th Light Horse Regiment, 11th Reinforcement |
| AWM Embarkation Roll number | 10/18/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A4 Pera on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 13th Light Horse Regiment |
| Fate | Returned to Australia |
| Date of death | |
| Age at death from cemetery records | 29 |
| Place of burial | Swan Hill Cemetery (Grave No. 464), Victoria |
| Panel number, Roll of Honour, Australian War Memorial | 9 |
| Miscellaneous information from cemetery records | Photo: Kent Fedorowich. Parents: Alexander and Janet SINCLAIR, 44 Bloomfield Road, Ascot Vale, Victoria. Native of Woosang, North Carlton, Victoria |
| Other details |
Commenced return to Australia on board HT 'Thermistocles', 4 May 1917; disembarked Melbourne, 2 July 1917; discharged Medal: British War Medal |
| Sources | NAA: B2455, SINCLAIR William James |
