It's a valuable pen in more ways then one, firstly because of the uniform worn in action, and then the gold coin makes it valuable in another way. The second way I've stated as it's value, is what would make me worry about it being stolen just for the gold. It is a beautiful pen.
Len
Seamus PM me, I would be willing to take a risk with a solid silver commerative U.S. Infantry coin if your up for the challenge!