This pen is from Signers' Mulberry, held to be the only still living tree planted by a signer, growing at Summerseat in Morrisville Pennsylvania. Summerseat was not only Washington’s headquarters for a time but also the home of two signers of the Declaration of Independence and the US Constitution – Robert Morris and George Clymer. 

This pen is shades of cream and brown with dark streaks and knot crossing the top. This tree is located at 40°12'29.28"N, 74°46'47.57"W. 

Pen Features.

Alternate hardware.