What is this stain by number 8?

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You will need to provide much higher quality images to receive any meaningful responses.
 
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BBQ sauce !?

But really hard to know one way or the other really. May be a bit of oil from watch maker when crystal was removed ?

But still we need better photos.
 
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Without high-resolution pictures, how could anyone tell?



This would be impossible, even at CSI: Miami. 😁
 
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The stain left by silent tears flowing through the soul that cleansed the heart of the watch’s previous owner…..or, more likely, as @STANDY says, BBQ sauce.
 
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Normal for your reference. Yours must be an early example with the stain at 8 o' clock. Normally that stain is between 9 -10 o'clock.
 
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Kidding aside. Could be a defect in the lacquer or paint on the dial.

Omega may have replacement dials, but will need movement caliber and case reference. Will also need to find a watchmaker with a Omega parts account to order one if available

DON
 
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Same stuff that was on the sweater that George Costanza tried to give away......something red. Could indeed be bbq sauce.
 
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An indentation from below that occurred during a prior battery change? The stain could be a paint touch up.

It's just a guess based on the fuzzy pics. If it's this, then it won't get bigger. Moisture that causes mold will get worse. The rest of the watch looks free of moisture damage. A leaking battery could cause damage to grow. Not possible to say from here.

What do you think it is, or isn't?
 
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What on earth is wrong with people?

What happened to “hello, pleased to be here, appreciate any help, please, thank you”???
 
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Looks like the dial foot has either bent the dial, or has been re-welded.

I defy anyone to contradict my finding based on the photos provided.

Of course, it could simply be a sneeze drop from a watchmaker with hay fever.
What region and when was the watch last serviced?