Arnold & Son 38mm Nebula - Special Edition 1 of 50 (Pre-Owned)Presenting the Nebula from the amazing Arnold & Son. This Special Edition version features a 38mm diameter case, which is a departure from the 41. 5mm case commonly found in the regular edition. The in house caliber is a pleasure to view from all angles. Movements with the balance up front can often look empty on the reverse side but this is not at all the case here, and while the movement is skeletonized, I thankfully did not find myself seeing skin