Just want to share with u guys my exp with swatch service centre ,,,
1st trip: send my omega po 8500 to remove a particle in caseback after seeking advice that it should be removed to prevent it from entering movement. Was told need to send in for a week for a simple job. Fine...
2nd trip:got my watch back, went home, found out there is a big piece of dirt sticking on the dial.
3rd trip: send it in to service centre, they check on the spot, open up caseback, told me can't be removed, in addition add in a few more big pieces of dirt in crystal. I told them to remove those new dirt pieces n also check wad could be done with the dirt sticking on the dial,
Got a call a few days later saying they will change the dial n it will take 2 months.
4th trip: got a call after 2 mths , watch is back, went back took watch, found out a few more dirt in crystal, dirt in hour marker ,scratches on the hour hands, scratche in caseback, scratches on lugs behind.
I finally decided send to a private watch repair shoop to remove those dirt . Those that can be removed r already removed. Those that stick to the hour makers can't be removed . As for the scratches in hour hands I decided to leave it alone since it's pretty small. Those scratches in caseback n lugs I also decided to accept it.

Was told by this watch repair guy that it's normal cause authorized service centre do not have the best facilities n they simply do not care,
Luckily for this shop, they have a suction hood to do all their work , so their quality is much better.
As for my watch, there are still dirt sticking to the hour marker n dial, scratches to the hour hands n caseback n lugs which can't be solved,. Decided to just wear the watch instead of sending it in..
So if u guys want to service yr watch,don't send it to authorized service centers if u want good outcomes.send it to private watch repair shops that r trustAble instead.. Not only their quality is much better, their price is also quite decent