pls help identify this watch (universal)

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It's not a Polerouter. I doubt if the model has a name, but I have certainly seen examples of it in the past. The reference number should be in the back, along with a case number.
 
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Yes indeed: 20371-1 followed by 2039797.
On the buckle it says 'plaque de rose and AW.

It was one of my grandfather's favorite .

Thank you for this.
 
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Watch dates to about 1960 based on the serial number. While not a Polerouter, it has the same microrotor movement and a external bezel similar to the Polerouter's internal bezel.

I can't tell the case metal from your pictures, but I suspect rose gold capped based on the engraving on the buckle.
gatorcpa