| Regimental number | 1864 |
| Place of birth | Paddington, New South Wales |
| School | Woollahra Superior Public School, New South Wales |
| Religion | Roman Catholic |
| Occupation | Clerk |
| Address | 14 Ruch Street, Woollahra, New South Wales |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Mother, Mrs H Lynch, 14 Ruch Street, Woollahra, Sydney, New South Wales |
| Previous military service | Served for 3 years in the Royal Australian Naval Brigade. |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 1st Battalion, 4th Reinforcement |
| AWM Embarkation Roll number | 23/18/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A8 Argyllshire on |
| Other details from Roll of Honour Circular | Name given on RoH circular as Robert Walton Frederick OTTER. Dux of Woollahra SPS 1908-9. |
| Miscellaneous details (Nominal Roll) | Name does not appear on Nominal Roll |
| Place of death or wounding | Flers, France |
| Age at death | 19 |
| Age at death from cemetery records | 19 |
| Place of burial | Bernafay Wood British Cemetery (Row G, Grave No. 28), Montauban, France |
| Panel number, Roll of Honour, Australian War Memorial | 30 |
| Miscellaneous information from cemetery records | Son of Bridget Amelia LYNCH (formerly OTTER), 14 Rush Street, Woollahra, Sydney, and the late George Frederick OTTER |