Photo by EMore98 (CC BY-SA 4.0), via Wikimedia Commons · shown: De Ville family photo
De Ville Hour Vision
The De Ville's exhibition-back variant with a skeletonised display: a large sapphire aperture on the case back reveals the movement, and the dial itself is partially open to show the cal. 8500's architecture. One of the few dress watches that doubles as a movement showcase.