Conn 6M Alto Saxophone ca. 1948

From the 1950's C.G Conn Saxophones catalogue:

In 1889, Conn pioneered saxophone manufacturing in America. Today, Conn saxophone are the most widely used in the world. Still first. Preferred by educators and professional musicians for sound carrying power, precise intonation and mechanical precision. And Conn has never stopped pioneering in saxophone design, maintaining the only full-time research department in the industry. From Conn research have come such improvements as Lustre-Conn brass finished, Calibore acoustical design, hydraulically expanded tubing, drawn saxophone tone holes and many more. Whether for growing or artist talent, Conn saxophones continue to set the standards for quality and performance.

Precision-formed body, bow and bell: All Conn saxophone bodies and bells are formed on ultra-precision mandrels. Bows are created in specially designed forms to insure accurate dimensions throughout. Acoustical accuracy is unerringly maintained.

Lustre-Conn Finish: Revolutionary advancements in brass finish. Lustre-Conn is not a lacquer and has proven itself over 7 1/2 times more durable and resistant to tarnishing than any musical instrument lacquer yet developed.

Hydraulically Formed Mouthpiece: Improved hydraulic-expansion process assures consistently accurate forming of saxophone mouthpipe. Each specific model has its own mold for this critical phase of manufacturing.

Calibore Acoustical Design: From mouthpiece to bell-flare the bore and tape of every Conn saxophone is scientifically calibrated to guarantee proper acoustical design. Permits precise A=440 tuning and even response in all registers.

Conn is the only manufacturer in the world with "total facilities" for producing saxophone keys! Conn saxophone keys are more consistent, finer in every respect, because only Conn has "total facilities" for producing saxophone keys. Conn is the only band instrument manufacturer in the world that has its own foundry adn foring presses, permitting complete control in every phase of key making... plus the full-time research department to constantly create new improved key design. For uniform performance, tonal beauty, response, carrying power and superb intonation, these are the preferred saxophones