Ok, so I searched a bit more because I thought there was something odd with the C&C listing ... Now I understand a bit more why I was confused.
The white steel De Ville GMT was done in 35mm (4862.31.32) and in 39mm (4833.31.32). From what I found in Omega's website, it seems than the white GMT is the only one existing in 35mm.
So when searching images of De Ville GMT, most of them are the 39mm version. My bet is 39 ones have plain caseback while 35 ones have an exhibition caseback. Maybe your retailer will be able to confirm?
The smaller size also explains why on the C&C pictures, the movement does not seem lost in the case (even if we cannot see a lot). And its dial is indeed a bit more busy than the others.
I managed to find another one on the internet (at least one that is not an obvious fake sold for $200), you can clearly see what it looks like on both sides.
https://www.fun4go.com/web-item.asp?id=14513
PS: When I read the first sentence of post, I was like.. WTF is happening!?
My first name is Jeremy... It took me some seconds to process the whole thing
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