No winner yet up to post #506.
I will say that someone between posts 310-506 got very close. However, that answer did not conform to the Common Species Name in the USDA database and therefore could not be accepted.
Here is another picture of the two pens. I purposely selected a blank for the top pen with a rather large void because I wanted to see if I could fill it and have the blank hold together without stabilizing this blank. The hole in the void went all the way through to the tube. I drizzled a little thin CA, stuffed it with shavings, drizzled a little more thin CA, and rubbed on a little more shavings. Spritzed it with accelerator, let it set a few seconds, then turned the blank. I was quite pleased with how well it held up.
The trunk of this species rarely gets to be over 6" in diameter. This one was a little under half that size at its largest point, but all the blanks I cut did come from the trunk.