| Regimental number | 37917 |
| Occupation | Engineer |
| Next of kin | Father, T Costin, 16 Luxford Street, Wellington |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 23rd Reinforcements, Specialist Company, Signal Section |
| Embarkation details | Unit embarked from Wellington on board HMNZT Corinthic on |
| Final rank | Private |
| Final unit | 1st Battalion, Otago Infantry Regiment |
| Fate | Killed in Action |
| Place of burial | No known grave |
| Commemoration details | Buttes New British Cemetery (New Zealand) Memorial, Polygon Wood, Belgium |
| Miscellaneous information from cemetery records | Father: the late Thomas Costin, Heretaunga, Wellington, New Zealand |
| Family/military connections | Brother: 49670 Pte Andrew COSTIN, 1st Battalion, Otago Infantry Regiment, died of wounds, 12 December 1917 |
| Sources | Nominal Roll Vol. 3: Roll 57, p. 25 |