It is not often that a watchmaker is so bold as to undertake the Herculean task of building the world’s most complicated watch. Indeed, Patek Philippe’s Calibre 89, which features 33 complications, has held the record for more than a quarter of a century. But today, in celebration of its 260th anniversary, Swiss manufacture Vacheron Constantin—one of watchmaking’s “Big Three”—officially unveiled the Reference 57260, a pocket watch eight years in the making that now, with an astonishing 57 complications, claims…