I believe mine is simply a Mod. 6. The receiver appears to have the same configuration as the one on your website.
It looks like there must be a firing pin assembly that flips up, or maybe rolls over to expose the chamber for loading. Whatever it is, it is missing, as is the hammer. Also missing are the pins that would hold both in place. A picture of these parts, either in place or out would be helpful. My greatest hope is that I can actually lay hands on one of these little guns and see just how they function. I think mine is complete enough that it could get there. jd
"We're all dummies, just in different ways." Old Okie Philosopher