There are really 2 separate sets of issues with these watches. One related to the escapement, and the other related to all watches using this F. Piguet base movement, so this includes 3113, 3200, 3202, 3203, 3205, 3301, 3303, and 3313.
The co-axial models have the issue of the 2 level compared to 3 level co-axial escapement, and in this case the 3 level is more reliable. The 3 level simply eliminates the potential for build of the sticky black residue on the intermediate escape wheel, like this:
Note this is just to illustrate what this looks like, and this was from a 2500C movement.
Of course none of the Swiss lever versions of this movement suffer from this problem, but there is a set of upgrades that were done to these over the years to solve other operational issues. These include things as small as replacing screws so they are less likely to snap, to replacing some levers and parts in the setting area. These upgrades were finalized in 2008, so any watch movement actually made after that should have all these upgrades done.
If not, they are not terribly expensive to do, and if I have a 3301 come in the shop, it usually has some, but not all of the upgrades done, so I typically have to replace a couple of parts.
The movement does have a bit of a bad reputation but IMO that really isn't deserved.
Cheers, Al
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