Know someone in the medical profession? (Want to impress your surgeon before surgery?) These are pens I made from, the Dr. Benjamin RushOak, and the Mercer Oak. Both trees are directly connected to two Doctors involved in the American Revolution. The Benjamin Rush Oak was planted over the final resting place of Declaration of Independence signer, Dr. Benjamin Rush, by the Women’s Temperance Society. The Mercer Oak was in the Battle of Princeton and used to support the mortally wounded Doctor and Brigadier General Hugh Mercer.