I recently got a rep with an Asian 7750 on the bench from a friend of mine. He wore it about a month and than the first signs showed.
First irregular power reserve, then it started to run extremely fast and finally last week it stopped completely.....So, as a good friend is supposed to I gave it a look. On the outside there was nothing strange to see. No screws caught up in the balance wheel, gear train free, pivots ok, reversing wheel ok.
So I promised him I would give it a full service. I started disassembling it last weekend. Take a look of what I found, and remember this watch was only 2 months old!
A lot of black gunk where the reduction wheel goes. That's no good sign...
Removed the second and following bridges and found oil everywhere, literally everywhere. The whole movement was contaminated. No wonder it stopped! It was as if the guy at the factory just sprayed in some silicone spray...
And than a very crucial part which needs oil to reduce friction (main spring arbor), NO OIL....
The main spring itself looked like an aquarium.. everything floating in oil.
And that boys and girls is why many of our Asian 7750's need a service.... bad or improper oiling.
All parts are now nice and clean after a good ultra sonic clean and this evening everything will be oiled and assembled. After regulation this puppy will run like a champ and IMO there is absolutely no reason to buy a Swiss version. After a good service it will perform and last as an ETA would.
Hope you liked the pics
Mark.