Walking stick with a hammer quality handle
What does "bottish" mean?
To the OP, check your local laws. No one here can really answer the question for you, but remember that a large pocket knife is the size of a paring knife. I wouldn't want to have to protect myself with a knife, and there are much better legal ways to accomplish this in the US.
If you have to work in a dangerous area, then carry pepper spray and an ironwood cane....with a brass handle. I prefer to avoid dangerous areas where I think I need to carry weapons.
Bots don't make spelling mistakes. I do think the op is perhaps a little trollish, though.