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Hawkes was taken over by Boosey around 1930. Serial numbers before that are (from this site):
| Year | 1st Number |
| 1895 | 11177 |
| 1900 | 18020 |
| 1905 | 21993 |
| 1913 | 39782 |
| 1920 | 42159 |
| 1921 | 44368 |
| 1922 | 45069 |
| 1925 | 51635 |
| 1930 | 60626 |