| Regimental number | 2380 |
| Place of birth | Richmond, Victoria |
| School | Central Richmond and Lithgow Street, Abbotsford State Schools, Victoria |
| Religion | Church of England |
| Occupation | Blacksmith |
| Address | 10 Lambert Street, Kensington, Victoria |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, William Sinclair, 91 Station Street, Malvern, Melbourne, Victoria |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 21st Battalion, 5th Reinforcement |
| AWM Embarkation Roll number | 23/38/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board RMS Osterley on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 21st Battalion |
| Other details from Roll of Honour Circular | Roll of Honour Circular lists middle name as Tasman and affectionate name as Wally. |
| Fate | Killed in Action |
| Place of death or wounding | France |
| Age at death | 20.6 |
| Age at death from cemetery records | 20 |
| Place of burial | A.I.F. Burial Ground (Plot VII, Row K, Grave No. 10), Grass Lane, Flers, France |
| Panel number, Roll of Honour, Australian War Memorial | 95 |
| Miscellaneous information from cemetery records | Parents: Martin and Margaret SINCLAIR, 10 Lambeth Street, Kensington, Victoria |
| Family/military connections | Cousins: Thomas Porter and Joseph Primal. |