Bushmaster, take a look at my old Special Trap in Frank Conley's book. It is not a brown gun. Until I saw yours, mine was the only one I had ever seen. Unfortunately, as nice as my old gun was, it was fitted with a recoil pad which I don't think is original.
The Iver in Conley's book is a mess compared to mine.
Moreover, mine has the original buttplate in good condition and the screws look as if they have never been turned.
You say that mine is the second that you have ever seen and yet it is not the type of gun that would generate any interest at Greenwich. Not sure I agree.
Lou