Ever wondered when your speakers were made ? This table lists speaker serial numbers against year of manufacture. The source of this information is a former Quad employee.
| ESL Serial Number | Year of Manufacture |
| 1 - 2000 | 1958 |
| 2000 - 4000 | 1959 |
| 4000 - 6000 | 1960 |
| 6000 - 8000 | 1961 |
| 8000 - 10000 | 1962 |
| 10000 - 12000 | 1963 |
| 12000 - 14000 | 1964 |
| 14000 - 16000 | 1965 |
| 16000 - 18000 | 1966 |
| 18000 - 20000 | 1967 |
| 20000 - 22000 | 1968 |
| 22000 - 24000 | 1969 |
| 24000 - 26000 | 1970 |
| 26000 - 28000 | 1971 |
| 28000 - 30000 | 1972 |
| 30000 - 32000 | 1973 |
| 32000 - 35000 | 1974 |
| 35000 - 38500 | 1975 |
| 38500 - 41000 | 1976 |
| 41000 - 44000 | 1977 |
| 44000 - 47400 | 1978 |
| 47400 - 50300 | 1979 |
| 50300 - 52100 | 1980 |
| 52100 - 52800 | 1981 |
| 52800 - 53000 | 1982 |
| 53000 - 53150 | 1983 |
| 53150 - | 1984 |
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