It has the cal 652
I thibk the „normal“ deville has only the 651. The case is finished in platinum. It seems rare, I ask my friends in Biel when i am at the factory again.
Check here:
https://onlineonly.christies.com/s/christies-watches-online-time-summer/de-ville-prestige-platinum-ref-127-0150-23/29740
According to Christie’s it’s a ref. 127.0150:
https://onlineonly.christies.com/s/christies-watches-online-time-summer/de-ville-prestige-platinum-ref-127-0150-23/29740 Best, Emmanuel