Thanks for your input. I put one coat of linseed oil on the end grain to see what it looked like, and it gave it a mild reddish tint. You can see that in one of the end grain pics and not in the other to show the difference. Before that, it was a lighter golden color. The main thing is that red oak has obvious rays running perpendicular to the grain, and chestnut does not. This wood does not, so I think I have ruled out oak.