Can you help me id this watch plz?

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the bezel is missing, but i can't find what reference it is. Is it franken or fake?
 
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Franken
With a 31 day subdial, a 24 hour subdial, and a day-of-week subdial? 🤨

That crown tho
 
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I'd be surprised if any of this was ever in an omega factory.

One trick of fakers is to make the item look distressed.
 
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If it already has the tachymeter printed on the dial, I want to know what the bezel indicated before it fell off
 
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If it already has the tachymeter printed on the dial, I want to know what the bezel indicated before it fell off
For this reference, the bezel would have had either the alphabet or zodiac symbols