As I said earlier, there is no way of proving a Black Diamond to be authentic unless there is some documentation of it. Since they continued making them for so long, they could be special ordered in any fashion in their later years just like the Model 12. So, they did not necessarily have to be a Trap Grade to be a Black Diamond. As far as the diamond stamping, we discussed this a while back on whether a Diamond Grade Model 12 had to have a diamond stamped on the magazine band to be authentic. I have personally talked to probably the best authorities on the Model 12 over the past few years about this and they all have different opinions on whether the Model 12s have to have the stamp to be authentic. So, there has never been any proof of that either. Unless you have the paperwork or some kind of proof, you'll never know for sure.
