I believe this is convertible to old band pitch as well as orchestra pitch. I've included a picture of the mouthpiece in case that can help date the clarinet.
Donated from estate
Thank you for contacting Mearto with your appraisal inquiry. Based on the photographs and information provided, this is a clarinet manufactured by unknown maker complete with case, circa 1930s to 1940s. The piece includes a Coupe Anches Cordier Clarinet Reed Trimmer and a mouthpiece manufactured by The Woodwind Company. The photographs indicate that new corks and possibly pads are needed, and the instrument shows moderate playwear appropriate for its age. For similar instruments with unknown makers in this time period, its fair market value is estimated at $50 to $75.