I have an XD45 that was custom engraved and S/N for my unit in Iraq by Springfield, 2/101st AVN. I wanted to know how I could value this as a collectors piece. I had a friend sell his .45 1911 they had made for about 3k I am assuming to a collector or an old war vet. I was thinking about selling mine to cover the costs of the M4 build I plan on doing. Any thoughts.. are pics needed?