The engraving still looks very nice, and the Damascus barrels are beautiful--I am going to assume the Damascus has been redone. If the stock is as nice as the rest of the pictures, it is a real beauty--far nicer than my GH 16 . Price/worth, would have to look at all the gun broker sites to find similar guns. With a few more pics, there are a lot of knowledgable folks here who I hope would give you some workable numbers--good luck and let us know if you end up with it.

As dean suggested, I suspect a checkering point up. And maybe a barrel refinishing. But the pictures are not of good quality.

I can tell that the gun does have high amount of original case left on the frame.