Lug-to-lug 52.3 mm 2.06 in
Case 42 mm 1.65 in
Thickness 12.8 mm 0.50 in
Lug width 22 mm 0.87 in
Wrist fit analyzer
Fit reference
Flat wrist width54.1 mmFit ratio0.97
Too smallIdealLargeToo large
Large
Likely to wear near the wrist edge; case shape and strap angle matter.
Sources
- https://www.montblanc.com/en-ca/montblanc-1858-geosphere-0-oxygen-MB133303.html
Official page lists MB133303 as a 42 mm stainless steel 1858 Geosphere 0 Oxygen with a 12.8 mm case thickness.
- https://www.watchuseek.com/threads/montblanc-1858-geosphere-review.4850655/
Review of the 1858 Geosphere case family measures the watch at 52.3 mm lug-to-lug; used here as the closest cross-check for the 0 Oxygen case architecture.
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