The following information was compiled from serial number records which were not complete. Because of this, it is to be used as a guide or rough estimate of when a King or Cleveland model instrument was manufactured. It does not pertain to those models which were marketed under the Gladiator, American Standard, or other trademarks.
| Date | Serial Number |
|---|---|
| 1893-1915 | 1-50,000 |
| 1915-1925 | 50,000-78,000 |
| 1925-1930 | 78,001-126,000 |
| 1930-1935 | 126,001-161,000 |
| 1935-1940 | 161,001-220,000 |
| 1940-1945 | 220,001-275,000 |
| 1945-1950 | 275,001-305,000 |
| 1950-1955 | 305,001-340,000 |
| 1955-1960 | 340,001-370,000 |
| 1960-1965 | 370,001-406,500 |
| 1965-1970 | 406,501-457,600 |
| 1970-1975 | 457,601-511,750 |
| 1975-1980 | 511,751- |