"Letter of Authenticity" seems as good a name as any. I usually order them to find out where the gun originally went and when. However, sometimes the letter confirms how "authentic" the gun I'm looking at is. Sometimes it is impossible to tell if the finish is original, whether the barrel has been cut, sights modified/replaced, or what the original stocks were. A letter can't tell you if the gun was refinished but it can tell you that a nickel gun didn't leave the factory with that finish. Letter of Authenticity works for me.

Jeff
SWCA #1457