There are quite a few one-piece fronts on 18th century English instruments ( many Dukes. Thomas Smith, and others). not so many in Italy at the same time, although plenty before 1700, and interestingly ( to do with grain orientation) there are equally as many pre 1700 Stradivari, if not more, with the later growth at the treble side rather than the bass. On different Stradivari violins, the later growth from the same log ends up at opposite sides of the belly.