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| Class | Callsign | Issue year |
| Full A | G2** | 1920-1939 |
| Full A | G3** | 1937-1938 |
| Full A | G4** | 1938-1939 |
| Full A | G5** | 1921-1939 |
| Full A | G6** | 1921-1939 |
| Full A | G8** | 1936-1937 |
| Full A | G2*** | pre-1931 |
| Full A | G3*** | 1946-1971 |
| Full A | G4*** | 1971-1985 |
| Full A | G0*** | 1985-1996 |
| Full A | M0*** | 1996-present |
| Full A | M5*** | 1999-2001 |
| Intermediate A | 2E0*** | 1991-present |
| Full B | G8*** | 1964-1981 |
| Full B | G6*** | 1981-1983 |
| Full B | G1*** | 1983-1988 |
| Full B | G7*** | 1988-1996 |
| Full B | M1*** | 1996-present |
| Intermediate B | 2E1*** | 1991-present |
| Foundation | M3*** | Jan. 2002-present |