Gorgeous Rollin Karg Signed Twist Sculpture Art Glass Paperweight For Sale

Gorgeous Rollin Karg Signed Twist Sculpture Art Glass Paperweight. Looks to be in great condition except for on the bottom I am not sure if it was chipped or came that way as it feels smooth and a small hole and what looks to be the letter C. (Please reference the last two photos) Please reference photos for the condition. I got this from an estate so I do not know much about it. If you need photos, please let me know