fountain pen

I have a letter from my great grandfather, dated 1910, documenting the pen was in his possesion for 50 years and was handed down in our family for over 200 years before that. The first knowledge of its history being with his great grandfather. He said in his letter that it is made of bone with the ink well made of bone and has the original quill pen. He states that it is as little shorter than the present make (5-1/8 inch) and is a little thicker. He said only heavy ink should be used because it was before the time of fluid ink. He also refers to this as the "Original" fountain pen. His letter was to LE Waterman Co. to see if they were interested in purchasing the pen. For some reason he never sent it. I recently inherited this when a family member died and am curious what this is worth.