Henri Pieper of Liege, Belgium sold guns marked as "Original Diana". All of these I am familiar with however also had the Pieper name on them as well. these were guns built under Piepers original patent for the "Mono-block" bbl construction. To my knowledge Pieper never used the term mono-block simply calling it a "One Piece" steel breech piece. I am not positive but I think perhaps that Beretta coined the term Mono-Block.
I would definately agree with Larry, the use of Diana by Beretta would have no connection with this gun.
