Lefevers. Everyone another special case. Lots of changes over the years. Some things added and somethings dropped. Only maker I know who increased the amount of engraving as time went by on each grade. My early E, F, G and H have much less engravingcthan the later ones. Adjustments screws went away also. His was a fertile mind which seemed to be ever trying to improve his gun. Maybe he had to just to keep up with the times and other makers. Having a cup of coffee to discuss how and why he changed his doubles would be a very interesting.