| Regimental number | 33629 |
| Place of birth | Sydney, New South Wales |
| School | Technical High School, Sydney, NSW |
| Other training | Technical College, Engineering School, Sydney, NSW |
| Religion | Presbyterian |
| Occupation | Engineering draughtsman |
| Address | 'Airlie', Victoria Street, Epping, New South Wales |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Mother, Mrs E S Finlay, 'Airlie', Victoria Street, Epping, New South Wales |
| Previous military service | Citizen Forces, Infantry and Engineers |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Gunner |
| Unit name | Medium Trench Mortar Battery Reinforcement 7 |
| AWM Embarkation Roll number | 13/129/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A9 Shropshire on |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 4th Field Artillery Brigade |
| Other details from Roll of Honour Circular | "Gunner W L Finlay was an Engineering Draftsman, and was a member of the staff of the Water Conservation and Irrigation Commission of New South Wales, under the Chief Engineer." |
| Fate | Killed in Action |
| Miscellaneous details (Nominal Roll) | *Year in date of fate unclear on Nominal Roll |
| Place of death or wounding | Zonnebeke, Belgium |
| Age at death | 22 |
| Place of burial | Perth Cemetery (China Wall) (Plot VI, Row D, Grave No. 20), Zillebeke, Belgium |
| Panel number, Roll of Honour, Australian War Memorial | 13 |
| Miscellaneous information from cemetery records | Parents: Dr. William and Elizabeth FINLAY, "Arawai", Serpentine Road, Greenwich Point, New South Wales. Native of Sydney |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |