Inside, the in-house self-winding Calibre MB 29.20 beats at 4 Hz (28,800 vph) with a power reserve of 42 hours. The Montblanc 4810 Orbis Terrarum (ref. 115071) has a price of Euro 5,890.
The same world timer function is implemented by Montblanc in the 4810 Orbis Terrarum Pocket Watch 110 Years Edition featuring a 53 mm Lépine style steel case which leaves plenty of room for the 24 city names.