Concerned about my watch

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I recently bought a vintage Omega, my first vintage watch, online from a private seller. When I recived the watch and adjusted the time the entire face turned back and forth as I turned the crown. I contacted the seller and he said this was common with the cosmic. Is this true, or is my watch a piece of junk?
 
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Even if a defect is common, that doesn’t make it acceptable.

Only because old Alfas commonly had rust issues doesn’t mean you wouldn’t do anything about it. Or that you wouldn’t expect the seller to highlight it…
 
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Is this true, or is my watch a piece of junk?

Well, it really shouldn't happen, but that doesn't mean that the watch is a piece of junk.
 
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It’s a nice looking watch.
You may have the option of returning it for a refund.
Alternatively, particularly if you like it, you can take it to a proper watch repairer and he should be able to service and repair it.
565 movements can last forever and are generally easy to service or source parts for
Since you are a ‘newbie', you may not be sure where to take it and, if you post your general location, someone on OF will be able to recommend a repairer in your general neighbourhood.
But - it’s certainly not a ‘piece of junk'.
 
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Maybe the case clamp got defected and couldn’t hold the movement. If you like it, just take it to your local watchmaker and they should be able to fix that.

Goodluck,
Khang
 
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Maybe the case clamp got defected and couldn’t hold the movement. If you like it, just take it to your local watchmaker and they should be able to fix that.

Goodluck,
Khang
Thanks!
 
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Wonder if this is why I see so many cosmics listed on eBay with off center dials. Dropping a follow in case you get it fixed and report back.
 
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Often the replaced crystals weren`t the right ones and in that case the movement with anything on board isn`t hold tight properly.
The contrary is that while installing the wrong crystal the dial is damaged beyond repair.
As a bad example:
http://www.ranfft.de/uhr/info-kva-e.html

If the amount of money you`ve paid was low enough I suggest to keep the watch otherwise get a refund.
When keep it take her to a watchmaker who knows it`s job.

I zoomed in your picture and yours has its dial damaged also to change it could be expensive a new crystal was forced in with the wrong tension ring which caused that damage.
Edited:
 
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Often the replaced crystals weren`t the right ones and in that case the movement with anything on board isn`t hold tight properly.
The contrary is that while installing the wrong crystal the dial is damaged beyond repair.
As a bad example:
http://www.ranfft.de/uhr/info-kva-e.html

If the amount of money you`ve paid was low enough I suggest to keep the watch otherwise get a refund.
When keep it take her to a watchmaker who knows it`s job.

I zoomed in your picture and yours has its dial damaged also to change it could be expensive a new crystal was forced in with the wrong tension ring which caused that damage.

Although I would take any repair advice from Roland (who says the movements fine but has the wrong lift angle on the timing machine), the point about the incorrect crystal is right.