| Regimental number | 2/2600 |
| Occupation | Electrician |
| Next of kin | Father, M A Costar, Manurewa, Auckland |
| Rank on embarkation | Gunner |
| Unit name | New Zealand Expeditionary Force, 9th Reinforcements, New Zealand Field Artillery |
| Embarkation details | Unit embarked from Wellington on board SS Maunganui on |
| Final rank | Gunner |
| Final unit | 11th Battery, 3rd Brigade, New Zealand Field Artillery |
| Recommendations (Medals and Awards) |
Military Medal |
| Fate | Died of wounds |
| Age at death from cemetery records | 24 |
| Place of burial | Lijssenthoek Military Cemetery (Plot XXVII, Row D, Grave No 18A), Poperinge, Belgium |
| Miscellaneous information from cemetery records | Commemorated on Roll of Honour, Selwyn Chapel, Christ Church (Anglican), Papakura, Auckland. Parents: Matoaka Atlantic and Sarah Caroline Costar, Karaka, Papakura |
| Medals |
Military Medal 'For bravery in the field.'
Source: 'London Gazette' Date: |
| Family/military connections | Brother: 48457 Pte Reginald Ernest COSTAR, 1st Battalion, Auckland Infantry Regiment, died of wounds, 13 September 1918 |
| Other details |
War service: Egypt, Western Front Medals: Military Medal, British War Medal, Victory Medal |
| Sources | Nominal Roll Vol. 2: Roll 21, p. 33 |