I usually see examples of these pistols with a third piece of wood under the front sight extension and just above the web of the hand.

http://i1057.photobucket.com/albums/...psjbrealuj.jpg

On other examples this appears to be missing.

http://i1057.photobucket.com/albums/...psrnn67sfx.jpg


Is it more likely that the third piece has been removed to suit the owner, or lost?

Or did some versions of the guns just not come with this arrangement in the first place?