Jem Mason Grand National Wins
- 1839 - Lottery trained by George Dockeray
Full Results
| Year | Horse | Result | Prize Money | Trainer |
|---|---|---|---|---|
| 1851 | Rat-Trap | 6 | - | Unknown |
| 1847 | The Roarer | Fence - Pulled Up | - | Unknown |
| 1846 | Veluti | Fence - Pulled Up | - | George Dockeray |
| 1843 | Lottery | 7 | - | George Dockeray |
| 1842 | Lottery | Fence - Pulled Up | - | George Dockeray |
| 1841 | Lottery | Fence - Pulled Up | - | George Dockeray |
| 1840 | Lottery | Fence - Fell | - | Unknown |
| 1839 | Lottery | 1 | £590 | George Dockeray |