| Blancpain Watch Index | Lange & Sohne Watch Index | How to regulate mechanical watches |
| Case | Dial | Thickness (mm) |
Diameter (mm) |
Bracelet | Calibre | Model Number | Ltd Edtn (pieces) |
| steel | white | 14 | 40 | steel | F585 | 2685F-1127-71 | no |
| red gold | black | 14 | 40 | leather | F585 | 2685F-3630-53B | no |
| Link to Leman Perpetual Calendar section of Blancpain website |