Polerouter Date

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Does anyone know with any degree of certainty if a Polerouter date was ever produced with a circular magnifier on the crystal (despite a trapezoidal window below it).

I've seen several examples floating around recently, and a quick look on polerouter.de shows at least 2 examples here:

http://www.polerouter.de/images/collection/polerouter42-big.jpg
http://www.polerouter.de/images/collection/polerouter20-big.jpg

What do you think? Replacement crystal or original?

Thoughts appreciated.

-eustace
 
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Original Universal crystals were signed with the "U" in the center, just like Omegas.

That's the only way I know to tell original from replacement.
gatorcpa
 
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I believe that some of the later polerouter dates did indeed have circular magnifiers.
 
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Does anyone have a better scan of this?


I hope someone does. I have the watch in the center:

802384E2-7D39-4058-AFC3-BC6B159AB52B_zpsecwnurew.jpg~original
gatorcpa
 
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Killed two birds with one stone.

Thanks!
gatorcpa