That’s a great find and both the burst and back are nice. Please share your thoughts after you’ve had a few weeks to settle in with this guitar and your impression about walnut.
I've had Walnut as a tone wood before, paired with Cedar.
It has some of the warmth of Mahogany, with some of the immediacy/ attack transience of rosewood.
Typically, its difficult to judge when one is playing the guitar as opposed to listening while some one else does that job.
The smaller see (compared to my OM guitars, means less air, so less resonance, but it's a very nice playing and sounding guitar.
The bindings are cheap looking, the finish was matt,satin, which I buffed out to a semi gloss (for now).
Black Walnut is a lovely wood, why Martin chose a finish to hide the woods' grain and natural beauty is beyond me.
