Here is an interesting item that I picked up years ago and forgot I had. It's a WW2 "Automatic Computing Sight For Turret (Upper) Local Control - Type K-3". It was manufactured by the NCR Company in Dayton, Ohio. I believe this was used in the B-17 and B-24. If anyone has any additional information, please feel free to add to the post. Since this is something I don't ordinarily collect, I will probably move it to the for sale section in the near future.