1. Boosey and Hawkes is a combination of the Boosey company and the Hawkes company. Hawkes produced their own instruments, for a time, and combined with Boosey in the 1930s. Boosey and Hawkes have been, since that time, sheet music producers and importers.
2. A lot of the saxophones stamped "Boosey and Hawkes" are stencil instruments. To read more about stencils, please read my article HERE.
1. A small, but significant, percentage of all Buffet and/or Evette-Schaeffer woodwinds in the 1900-1930 range (or so) were Conn stencils and do not have Buffet serial numbers. In the 1990's, Keilwerth stenciled a saxophone for Buffet called the "Expression" and that model has a Keilwerth serial number.
2. The modern Buffet 400 (and similar) are Asian-made and do not follow these serial number charts.