Which Church tradition (or denomination) can actually demonstrate unbroken Apostolic succession?

Many Church traditions claim unbroken Apostolic succession such as Eastern Orthodox, Anglican, Roman Catholic, and others. It seems as though there are gaps in the successions of some of these traditions where they are delineated. Can any Church tradition or denomination actually demonstrate unbroken Apostolic succession or are there gaps in every account making them all just claims with varying degrees of 'proof'?