>>478752german no.3 repotin in
welp that one fugged up knife
look at this pic the blade length is defined s the length to the parry guard. (red length)
you dont look at the cutting edge (yellow) and you dont subtract the bottom bit (green) just because its different.
it needs to be shorter then 12 cm or it will never be legal
most accurate summary i have seen in the past is >
http://www.vivalranger.com/index.php/wissensdatenbank/outdoorrecht/96-outdoorrecht-teil-i-messer-machete-multitools(this covers other out door legal stuff in the other sections)
but if you carry it in your bag you will almost never have any problems.
unless you cause suspicion that the knife could be use as weapon and not as a tool. if you look like a homeless guy at the train station at 3 am you might get fucked. if you are sharpening your stick to bbq some sausage at the baggersee no one will give a shit.