Montblanc 4810 Collection watches

The Montblanc 4810 collection is named after the height of Mont Blanc in metres, a number that runs through Montblanc's branding. The 4810 line first appeared in 2006 for the brand's centenary, and Montblanc renewed it in 2016 for its 110th anniversary, keeping the rounded case and the star emblem near 6 o'clock of the original Star 4810 watches.

The 4810 Orbis Terrarum (115071) is the world-timer of the line. It reworks the 41 mm Heritage Spirit Orbis Terrarum of 2015 in a 43 mm steel case with short, rounded lugs. A sapphire disc shows the continents as seen from the North Pole, ringed by 24 city names, and the map is coloured by climate zone; beneath it a second disc shades day and night and carries a 24-hour ring. The pusher at 8 o'clock moves the time forward one zone at a time in one-hour jumps without disturbing the minutes. Calibre MB 29.20 is automatic, built on a Sellita base with the world-time module integrated into the movement, and runs for about 42 hours.

The 4810 Orbis Terrarum Great Britain (117186) was a run of five pieces sold at Montblanc's Bond Street boutique in London to mark the eighth SalonQP at the Saatchi Gallery. Mechanically it is the standard watch; the change is on the dial, where the Union Jack takes the place of the usual day and night disc and fills the continents.

The rest of the 4810 range is simpler. The 4810 Date Automatic (114841) and 4810 Day-Date (114853) are 40.5 mm steel watches with silver dials, about 10 mm thick. The 4810 Chronograph (114856) is a 43 mm steel model with a silver dial on a steel bracelet, and at about 13.7 mm it is noticeably thicker than the Orbis Terrarum, which shares its 43 mm width but stays under 12 mm.