Help with no lume polerouter date

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Hi, I’m looking at possibly purchasing a polerouter date with no lume and silver dial. I don’t have an issue with how the dial looks as a whole but the only thing I question about it is I can’t seem to find another watch the same online. The only non lume silver dial date references I can find have the later chapter ring and the applied u logo rather than the shield. Does anyone know what the reference this could be?

Secondly the micro rotor doesn’t seem to be made out of the correct material or is it just heavily worn?
 
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Perhaps a non-lume variant of the 204503/3 or a non-lume reference not yet documented.

Is there not a reference number either between the lugs or on the case back?

The rotor is just badly tarnished I think. The part below also looks rusty. This would be a concern.
 
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Perhaps a non-lume variant of the 204503/3 or a non-lume reference not yet documented.

Is there not a reference number either between the lugs or on the case back?

The rotor is just badly tarnished I think. The part below also looks rusty. This would be a concern.

Thanks for the help, the case back has been slightly polished so you can still see the markings in the centre but sadly not the reference or serial,

I have asked for better photos to see the condition of the microrotor so hopefully that will give me a better idea of what work may need doing
Edited:
 
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Thanks for the help, the case back has been slightly polished so you can still see the markings in the centre but sadly not the reference or serial,

I have asked for better photos to see the condition of the microrotor so hopefully that will give me a better idea of what work may need doing

I now have more pictures of the rotor and it does look very tarnished, how much does a 215 rotor cost at the moment?
 
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Tarnish will likely disappear at clean/service. I'd be more concerned about the fingers of the wheel to the left of the rotor-are they all the same length?