AW037 – Elite Model. The upgraded replacement for the A9937 model, the AWO37 is truly the ultimate alto. It features a sterling silver body, bell, bow and neck with beautiful hand engraving .It also benefits from the WO series re-engineered bore and toneholes, and re-sourced and redesigned core brass material. This model also has many upgraded features exclusive to the WO series such as newly designed Front F Keys, Ride Side Keys and Right Pinky Key. This instrument is truly a work of art, and sounds just as special as it looks.