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.
The popular King Super 20 (may also have H.N. White engraving) differed greatly in tone over the years. Super 20’s were made with brazed-on toneholes until the early 1970’s (the same way Martins were). This allowed the metal thickness to be uniformed for each tone hole and now thinness in the body tubes. The later horns were made in Japan with drawn toneholes. These later horns apparently sounded much different from earlier models and have a brighter tone.