Some Wenger cases do seem a bit more flat, though not as much as Vichet. While the images below aren't perfect, you can see that the level of the "domed" shape https://is.gd/5o3G1N link varies. Then you can also compare https://is.gd/rB0EYn link to the much flatter Vichet case https://tinyurl.com/z8d7jraj link below.

https://v.gd/BvBWgf </br>
https://tinyurl.com/ysj9vdst </br>
https://v.gd/JFiHWZ </br>

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https://images.google.co.ma/url?q=https://www.pascheromega.cz/montres/1957-limited-edition/
https://forum.aigato.vn/user/xalannif </br>