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This is a high-quality generic mainspring specifically designed for the Cartier in-house Caliber 1847 MC automatic movement. Introduced in 2015, the 1847 MC measures 26.2mm in diameter and a mere 3.6mm in thickness, featuring a distinctive traversing balance bridge, an efficient bidirectional winding system, 23 jewels, and a 28,800 vph beat rate. Unlike the twin‑barrel 1904 MC, the 1847 MC adopts a classic single‑barrel design—delivering a practical 42‑hour power reserve while significantly reducing overall thickness and movement complexity.
High-Precision Fit: Dimensionally matched to the Cartier Caliber 1847 MC, ensuring perfect seating within the barrel.
Premium Alloy Construction: Manufactured from high-strength Nivaflex® alloy, offering excellent resistance to metal fatigue and a stable torque curve over years of use.
42-Hour Power Reserve: Delivers a consistent torque release, directly supporting the 1847 MC‘s practical 42‑hour power reserve.
Single‑Barrel Design: The 1847 MC’s single‑barrel architecture demands a mainspring with high energy density and stable torque. This spring meets that requirement without compromising the movement‘s slim profile or cost structure.
Q1: Does my watch always need a mainspring replacement during routine service?
A: Not necessarily. If your watch runs well, winding feels smooth, and the amplitude is healthy (250°–300°), you don‘t need to replace the spring. But because the 1847 MC has only a single barrel, if amplitude consistently stays below 220°–230° after cleaning, the spring has fatigued and must be replaced to avoid stalling.
Q2: The outer hook slot on my barrel wall is heavily worn. Can I replace only the mainspring?
A: No. A worn slot will not securely hold a new spring; the bridle will slip. For a precision single‑barrel system like the 1847 MC, the right solution is to replace the entire barrel assembly.
Q3: Can I skip the mainspring winder and wind the spring by hand?
A: No. The 1847 MC mainspring is extremely thin and soft. Hand‑winding will almost certainly distort the inner coil and may break the bridle almost into the first full turn. Always use a proper mainspring winder. Skipping it will compromise torque stability and destroy timekeeping accuracy.
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