That brings us to the movement, which is a in-house developed and manufactured movement, named calibre PF315, that indicates time and date. This movement has two series-coupled main spring barrels, which together hold 42 hours of autonomy when fully wound. For the critical reader this might sound strange. makingwatches wdfreplica Most movements with a single main spring offer 42 hours of power reserve, so why does a movement with two main springs, coupled in series, deliver exactly the same? There s a perfectly good reason for this and one that testifies that Parmigiani Fleurier is doing a proper job when it comes to high-end watchmaking.