Those plastic parts are not in the drive train, but on the calendar complication, so, technically, this does not fall under the restrictions of this thread.
You make a good point...none the less I welcome any information so that it can at least be documented and discussed.Those plastic parts are not in the drive train, but on the calendar complication, so, technically, this does not fall under the restrictions of this thread.
Neither do the 7750, the Omega, or the LEM 5100, which have plastic parts in the chronograph complication.
Very few movements have plastic in the drive train.
Both sides of metal versus plastic has been discussed ad nauseum on this forum.The ETA 2841-1 has a plastic pallet fork and escape wheel. You can clearly see it in the Swatch skeleton watches such as the "body and soul" and the "uncle charly" ( the latter of which I own) if you look closely through their crystal.
Not being particularly knowledgeable about these things, I had some reservations about getting a sistem51 following the very averse reactions I witnessed posted in a blog article in which revelation of the same plastic parts in that movement was pointed out. Then I go looking on the web and discover that there are "proper"movements with the same plastic drive train parts that nobody seems particularly perturbed about.
So, as far as plastic is concerned, I find no evidence thus far that metal parts of this type are superior to plastic, or that some plastic parts in a movement make it inferior. I stand to be corrected of course.