Just curious to find this on web...

seems like 20357, but is it correct match of case, hands and ring?

 

There are references with steel cases but with gold rings e.g. 20360/4.

This is actually an H20217/10 and belongs to @CafeRacer - this image is on his IG account along wth some explanation.

We've seen very very few examples of this reference and so nobody really knows what they would have looked like (according to the Polarouter advert with model descriptions, this had a 'deep blue' marker ring) or would look like now.

 

As above... The photo and watch is mine.
There were very few "mixed metal" polerouters, but they were very specific reference numbers - e.g. S or H 20217-10, 20360-4, and a Super 869118-01 and -02 (As shown in the site gallery and tables: https://universalgenevepolerouter.com/photo-galleries/referencegallery/).
(Not forgetting the Jet series).
There are likely more than just these, but we have not discovered them yet.
If there are, they should be very specific case reference numbers, which do not match with one that is already described in full steel etc.

 

I am guessing that this One is the Super

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/113922249634

The dial seems in relative good condition, not sure if the crown us original, the plexi is a replacement and the case probably polished.

 

Yes, that's the 869118/02. Looks like the bezel and case have been polished though - I suspect both would have had a brushed finish originally. Missing the original crystal with loupe too. Photo of eBay watch below for the record.