John,
The D stands for Damascus. They used S-steel, T-twist and D-damascus. Without pictures, it is hard to say how unique it is. Number 1,000 has the most unique engraving of any Aubrey that has surfaced so far. You say yours has Star Damascus, 6 iron, which makes it rather unique. A trap gun would certainly be something! Please post some pictures when you can.
Dave,
I don't see "gun" as the second word. Look at the "g" in clergyman. I will accept it until some one can read that scribble.

There were a lot of factories in Meriden at the time. They were producing glass, flatware and any number of other items. What fun would it be if we had all the records from all the makers?
Pete