Founded in Germany in 1925, the world-famous saxophone brand was acquired by the veteran musical instrument manufacturer Buffet in 2010

Julius Keilwerth. Calvos was founded in 1925 in what is now the Czech Republic. After the Second World War, the company moved to its current headquarters in Nauheim, near Frankfurt, Germany.

The real rise of the Calvos brand began in 1986, when jazz saxophonist Peter Ponzol was hired as a consultant to improve and redesign the Keilwerth saxophone for the jazz style. In the late 80's, Keilwerth launched its SX90R series and received praise from many jazz musicians such as Brandford Marsail, Courtney Pine, Emie Watts, James Moody, Ron Holloway, Mike Smith.

Bossy & Hawkes 在1989年买下了Keilwerth工厂并在1996年将其与Schreiber公司合并。合并后的公司于2003年被出售给The music Gruop 。2006年The Music Group 又破了产。Schreiber & Keilwerth 成为一家独立的公司。2010年3月，Schreiber & Keilwerth再次申请破产。2010年8月1日，被老牌乐器商布菲公司收购。