| MODEL | Grand Régulateur Nautique |
| Limitation | 8 pieces |
| Ident No. | 107582 |
| MOVEMENT | |
| Calibre | MB M16.30 |
| Movement type | Manually wound monopusher régulateur chronograph |
| Chronograph | Monopusher chronograph mechanism with column wheel and horizontal coupling |
| Indications | Hours and home time at 12 o’clock, central minutes, seconds at 9 o’clock, day and night display at 2 o’clock, patented emergency power reserve at 6 o’clock |
| Displays (Chronograph) | Central seconds, 30-minute counter at 3 o’clock |
| Diameter | 38.40 mm |
| Height | 7.90 mm |
| Number of components | 304 components |
| Number of jewels | 33 jewels (hemispherical, cambered, olive-cut) |
| Power reserve | Approx. 50 h |
| 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, “Côtes de Genève”, 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 | Sapphire crystal case back |
| Crown | Integrated chronograph button with Montblanc emblem in mother-of-pearl |
| Dial | Open dial to reveal parts of the movement |
| Hands | 18K gold, chronograph hands in Pfinodal ® |
| Horns | – |
| Diameter | 43.5 mm |
| Height | 14.67 mm |
| Water resistant | 3 bar (30 m) |
| STRAP | |
| Material/Colour | Hand-stitched alligator-skin / Blue |
| Clasp/Buckle | Pin buckle in 18K white gold |