Joe, that's probably pine with a mahogany/dark cherry or walnut stain. One of the pics you put on twitter looked more walnut like.
Ya, the top looks different than the sides, but I imagine it's just from more stain penetration. From what I've seen walnut is decently knot free. The top has more pine-ish looking knots. If this is even a thing.
Oh, no, I think it's quite likely that it's pine. I meant that it was a walnut or mahogany/dark cherry (colored) stain over pine.