I'm told that it is a complete perpetual calendar/chrono from the ground up...not stacked components.
Here is some technical stuff from the Blancpain website...
| Ref. 4286P-3642A-55 Split-second Flyback chronograph, perpetual calendar, moon phase, Le Brassus, leap year indicator, opaline dial, self-winding |
| Complication | Perpetual calendar |
| Self winding | Yes |
| Date | Yes |
| Double window date indication | No |
| Automata | No |
| Case material | Red gold |
| Case thickness | 15 mm |
| Case diameter | 42 mm |
| Water resistance | 50 m |
| Between horns | 22 mm |
| Sapphire back | No |
| Carat measurement | No |
| Dial | Opaline |
| Bracelet | Croco |
| Calibre | 56F9A |
| Calibre thickness | 8.1 mm |
| Calibre diameter | 26.2 mm |
| Power reserve in hours | 40 |
| Power reserve indication | No |
| Jewels | 38 |
| Components | 466 |
| Limited edition | No |