Heavy Cut Crystal Decanter with Stopper

This is an unmarked heavy (2.10 lbs) Crystal Decanter with a stopper. The decanter has no markings or tags and I have added pictures of cuts or scratches because I don’t quite understand them. It is almost like it was carved from the inside. The decanter measures 5 7/8 inches tall or is 7.50 inches with the stopper. It is 4.25 at the widest point and about 3.00 inches deep. The decanter has been cut to clear on the body in large arches from the base up. It has actually cut on each of the four sides and then again in between those cuts. The stopper is large and flat cut on all sides and is a perfect fit. What I don’t understand are the scratches or cuts inside the bottle as shown in pictures 2 & 3. The bottle has one chip on the base as shown in picture 10. The base is thick and clear, and it looks like it is made for some expensive whisky. Item:10978 Location # 4/2