HELP Please - 1968 SM300 in for service...

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Looking at their website (which is a bit vague) and Yelp, it looks like they may indeed be factory certified....and they all have the fancy white jackets

Edit: I had to edit my post. Being anal retentive, I thought something was wrong with my watch after service. I went to the watch maker 3 times. He took care of me each time. So I just want to make sure my experience is correctly captured here.

The person at left in the photo is the owner of USA World Time San Jose store. I suspect that photo was from class getting trained or certified.

I recently used this shop for service. Store said it is Omega certified and can source Omega parts. While there, I spoke to couple other customers (like for service, not just battery change or bracelet adjustment). They provided positive feedback.

My Omega watch was serviced in 3+ weeks, which was good turnaround.

(New edits)
After service, I thought my watch was behaving weirdly. Now, I believe there was nothing wrong with the watch. I was just being anal retentive. Each time, USA World Time took care of me. So if anyone is considering using USA World Time in San Jose, I highly recommend the store.

(New edits: Long version with details)
After I get my watch back from service or regulation, I wear my watch for 1 week, and accuracy was within COSC spec. Then I let the watch wind down, both to check power reserve and also wear my other watch. After power wind down, I did manual wind but I didn't wear the watch. So I checked the accuracy for 24-36 hours and accuracy was off by around 5-7 seconds per day. I did this after each service and regulation. Each time I thought something was wrong and brought the watch back in. USA World Time did the timing analysis and regulated my watch every time. For the last time, he kept my watch for 1 week to check the accuracy over a period of time.

After last regulation, my watch accuracy was basically 0 to -1 second per day. Then after wind down and manual wind, watch was running -5 seconds per day for 24 hours. But this time, I did something different; I wore watch after that. Once I wore the watch, the accuracy returned to 0 to -1 seconds per day. I never measured my watch with manual wind before service, so I didn't know how it behaved previously. Just logically it seems kind of weird. I care about accuracy when I wear the watch, not when I do manual wind. So no problem at all.

Then another concern I had was with the rotor sound. I don't recall how my Omega sounded when brand new, as that was 14 years ago. Prior to service, I do recall I can feel the rotor's momentum if I swing the watch side-to-side, but I don't recall hearing any sound from shaking the watch up/down in the direction of the dial. After service, I can hear the rotor vibrating when I shake watch up/down. So I thought something is wrong. USA World Time actually showed me 2 different Omega, 1 Rolex, and 1 Ulysse Nardin that he had on the table. They had different sounds, but they all had some rotor vibrating sound when watches were shaking up/down. He said that sound can vary by amount of oil.
Edited:
 
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Looking at their website (which is a bit vague) and Yelp, it looks like they may indeed be factory certified....and they all have the fancy white jackets

Lab coats? Nobody said anything about lab coats!

Neither of my go-to shops use lab coats. Rats!

Guess I need to find another watchmaker. This vintage watch stuff is hard!
 
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If you insist on yanking it from them, send it to Nesbit's in Seattle. Omega authorized service. You can take the train up to drop it off.