Thanks to all who answered. My mom will be thrilled, as we have not been able to find much info til now. Someone offered her $1500.00 for the knife a few years ago but she would not sell. Wants to keep it in the family. Nice to know that it is celluloid, not bakelite. Hers is simular to the photo posted. I will print all responses to my question and send them to her. Thanks again