We learn in the movie that Shanks had a bounty of 1 billion 12 years ago, it matches with his fights against Mihawk so we can assume that Mihawk had the level of a YC1 12 years ago
We don't know when Mihawk obtained the title of best swordsman + his shishibukai title but one thing is certain is that in 12 years, Mihawk has become even more powerful than before
We don't know when Mihawk obtained the title of best swordsman + his shishibukai title but one thing is certain is that in 12 years, Mihawk has become even more powerful than before