Published by on August 18, 2026 Montblanc 1858 Zero Oxygen "The 8000" Chronograph. 42mm case, 14.7mm thickness, 52mm lug-to-lug. Wears very similar to IWC Big Pilot. Quick release bracelet. Micro-adjust clasp. There is a small ding on the non-crown side of the case near the 12 o'clock lug, too small to capture in photo.