For the sake of clarity (read: muddying the waters.) the original question should be restructured. I do not believe any country has nationalized tobacco pipe production. So, no country makes pipes. What should be asked is: "In which country are the most pipes produced." Which then requires further refinement. If the stummel is made in, say France, and finished in Italy does Italy get to claim production of the pipe or, must it share production with France?
Which leads to a different question of whether a person who purchases a stummel and does the final creative steps to make a functional pipe may, in fact, claim to have made a pipe. The fact is this person only finished a pipe after receiving a stummel, which may or may not have been drilled. If that is the case perhaps they should be known as a pipe finisher who carves. Or, a carver who finishes pipes? But, this should be a question for another thread which I, in the interest of nothing at all, will not posit.
I offer these questions only in the interest of stimulating the discussion, of course.