Corum presented the AC-One 45 Openwork Automatic with an exquisitely crafted skeletonized dial. The movement fitted within the AC-One Openwork Automatic is the caliber CO 297, a new movement that was developed by Corum in-house specifically for this model. The bridges visible on the dial side were specially designed to be in harmony with the dodecagonal-shaped case, as well as the silhouettes of the nautical pennants. A sub-dial displaying small seconds is at the 9 o’clock position, while the power reserve indicator sits at 3 o’clock.