So the boker thing. I have always been intrigued by this. My understanding how to tell at a glance is that if it has SOLINGEN anywhere on the knife its German manufactured and another giveaway is the prominent laser ethcing on the main blade a la Bulldog brand knives. The ones with the tree on the blade are the Chinese sourced ones I believe.
The current production Solingen Bokers are GREAT though in my limited exposure. I have a full size stockman coming in wood...C'mon mailman, I cant sit by the window and wait for you forever!
There are no hard and fast rules as it depends on the vintage of the knife. I have a Boker Tree Brand with the Tree Brand etch on the blade, and it most certainly was made in Germany.