| MODEL | Grand Tourbillon Heures Mystérieuses |
| Limitation | 8 pieces |
| Ident No. | 104874 |
| MOVEMENT | |
| Calibre | MB M65.60 |
| Movement type | Manually wound movement with 1-minute tourbillon at 12 o’clock |
| Chronograph | – |
| Indications | Hours and minutes at 6 o’clock, seconds on tourbillon cage at 12 o’clock |
| Displays (Chronograph) | – |
| Diameter | 38.40 mm |
| Height | 9.7 mm |
| Number of components | 281 components |
| Number of jewels | 28 jewels (hemispherical, cambered, olive-cut) |
| Power reserve | Approx. 45 hrs |
| Balance | Screw balance, Ø 14.5 mm; 59 mg.cm2 |
| Frequency | 18,000 vibrations per hour (2.5 Hz) |
| Balance spring | With Phillips curve |
| Plate | Rhodium-plated German silver, circular-grained on both sides, hand-chamfered edges |
| Bridges | Rhodium-plated German silver, recesses circular-grained on both sides, hand-chamfered edges |
| Going train | Wheels: gold-plated, circular-grained, chamfered, diamond hubs on both sides Pinions: polished faces and toothing, burnished pivots |
| CASE | |
| Material | 18K white gold |
| Bezel | – |
| Sapphire crystal | Cambered sapphire crystal |
| Case Back | Screwed case back |
| Crown | With Montblanc emblem in mother-of-pearl |
| Dial | Solid 18K gold dial with hand-crafted silver-plated circular-grained decoration |
| Hands | Hour and minute hands indicated on “mysterious” sapphire crystal discs |
| Horns | – |
| Diameter | 47mm |
| Height | 14.80 mm |
| Water resistant | 3 bar (30 m) |
| STRAP | |
| Material/Colour | Hand-stitched alligator-skin / Black |
| Clasp/Buckle | Pin buckle in 18K white gold |