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First off, there's the movement. The caliber L121.2 is based on the L121.1, which replaced the L901.0 as the "standard" Lange 1 caliber in 2015. On link top link of that, it has Lange's new moon-phase complication, which is accurate for up to 122.6 years without needing any adjustments (assuming you survive that link long and keep your watch wound).