Thanks Dwight for answering.
My technical english isn't very good and I suppose that "holdopen" means the system which holds the toggle opened with an empty magazine in gun.
My #60067 pistol does not have holdopen. So, it seems logical that #55361 and #55631 haven't original holdopens system...
How can we be sure that an holdopen system is original?
I suppose military P08 did get this system before commercial models. If not, how can we explain that some 1912 military pistols have it and not an early 1913 commercial model?
Thx,
Fran�§ois