Rolex main plate mystery number

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Most people know the relevance of the Calibre number and the Serial numbers on Rolex watches, but one other number puzzles me.
The number engraved on the Main Plate does not seem to relate to anything else on the watch - this goes for all of the watches that have them.
I've attached a photograph from a Daytona 16520 but many other models have them too.
I've searched the internet without success and might be missing something obvious , so any advice would be much appreciated.
 
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It's Rolex's serial number for the movement. Unlike Omega, they don't use matching serial numbers. I'm assuming Rolex enters it upon service to determine if the movement is original and correctly matched with the case's serial as when it left the factory.
 
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There is no way to decode them or gain any knowledge from these numbers either. They’re just a serial for the movement.
 
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There is no way to decode them or gain any knowledge from these numbers either. They’re just a serial for the movement.

Thanks for the info - I was thinking of having the movement replaced for a new one and so wondered if this number related to the watch serial number, which to me seems the only logical reason for it - as per meme dweller comment.
Edited:
 
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Thanks for the info - I was thinking of having the movement replaced for a new one and so wondered if this number related to the watch serial number, which to me seems the only logical reason for it.

It would be interesting if someday Rolex started opening their records (e.g. by offer Extracts from their archives). I wouldn't be surprised if they tracked these numbers.
 
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Thanks for the info - I was thinking of having the movement replaced for a new one and so wondered if this number related to the watch serial number, which to me seems the only logical reason for it - as per meme dweller comment.

Why would you replace the movement? That seems like an extremely expensive solution to whatever your problem is.

I think you misunderstood me about the movement serial. It is tired to the case serial and rolex does keep track of this information.
 
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It would be interesting if someday Rolex started opening their records (e.g. by offer Extracts from their archives). I wouldn't be surprised if they tracked these numbers.

In a way they do.

There is a little known Rolex service where they offer restoration of their vintage pieces. They’ll make parts, reprint dials, everything. It’s hideously expensive. The starting point is $10,000. That’s the cost at the door, then whatever the parts and labor are on top of that. It was $10,000 a couple years ago, not sure it’s still there now. But they’ll verify everything for you.
 
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In a way they do.

There is a little known Rolex service where they offer restoration of their vintage pieces. They’ll make parts, reprint dials, everything. It’s hideously expensive. The starting point is $10,000. That’s the cost at the door, then whatever the parts and labor are on top of that. It was $10,000 a couple years ago, not sure it’s still there now. But they’ll verify everything for you.
Interesting. Do you know the name of this restoration service?
 
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Why would you replace the movement? That seems like an extremely expensive solution to whatever your problem is.

I think you misunderstood me about the movement serial. It is tired to the case serial and rolex does keep track of this information.
Yes I understand what you mean, but it's a long story!
 
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Interesting. Do you know the name of this restoration service?
I think I would rather not know thanks!