2015 116234 sounds grainy while winding

[Maximame]

Good morning gentlemen,

Two days ago, I acquired a beautiful 116234 from a trusted pre-owned dealer. The watch is like new and runs within the COSC specs. According to the seller, it was serviced in February 2024. However, I noticed that the winding sounds terribly grainy. I realized this upon buying it but assumed it was because it was fully wound. Today, however, after it powered down, the issue persists, and I decided to bring it back for a check tomorrow.

I even doubted that the movement inside was an ETA or a clone, but I opened it and confirmed it's all genuine.

I’ve had many 3135s and know how the winding is supposed to sound, but mostly from the 90s. This is my first Rolex with a "late" 3135, so I might not be familiar with the feeling. Any advice would be welcome.

I am also enclosing a quick video.

Many thanks,

M