This rare derringer is in excellent + condition.  Exhibiting 95% factory blue on the frame and 75% factory blue on the barrel. The bottom of the grip frame has what appears to be a museum inventory number ( FB-160) .  It's serial #3265 appears on the inside of the frame and the bottom of the barrel. The action works fine. The barrels bores are perfect and it may never have been fired.  A real top of the line Collector quality arm. 
Sold