A good restoration is difficult to detect in hand. Over the internet thru pictures, it's near impossible to tell with a good restoration.

The late Marlin guns in original high condition that I've seen didn't look quite that good in hand. The colors of those I saw were not quite so brilliant. But hey, colors of a photograph are so variable, it's difficult to for me say this gun is not original based on colors. Same for stock finish. But then, stock finish on a field grade LC was probably not something they spent a lot of time on in the factory. I would bet a lot of original stock finish would have flaked badly by now.