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This is a genuine Vacheron Constantin original factory date wheel for the Caliber 1312 automatic movement, a critical component of the calendar mechanism that enables date display and quick-set function. The Caliber 1312 was a widely used automatic movement by Vacheron Constantin throughout the 1990s and 2000s, powering classic collections such as Patrimony and Historiques Toledo in both square and round cases. Featuring 27 jewels, an approximately 40-50 hour power reserve, and the prestigious Hallmark of Geneva “Seal of Geneva” (Genève) certification for its exquisite finishing, the movement epitomizes Vacheron Constantin‘s philosophy of “understated luxury”.
As an authentic OEM part, this date wheel is the most reliable replacement for professional watchmakers when repairing calendar wheel jamming, date quick-set failure, wheel tooth wear, or enlarged center bores that cause hands to stop advancing.
Genuine Quality: Factory-produced by Vacheron Constantin Switzerland, brand new, with material and precision standards fully compliant with the movement‘s design specifications.
Compatible Movement: Vacheron Constantin Caliber 1312 automatic movement; actually developed from the renowned Girard-Perregaux GP 3200 or 3300 automatic caliber platform. Features 27 jewels, a beat rate of 28,800 vph (4 Hz), a power reserve of approximately 40–50 hours, and the Hallmark of Geneva (Poinçon de Genève) certification.
Quick Date Set: The Caliber 1312 is equipped with a “quick date set” (also described as “semi‑quickset”). This function is not operated via the crown’s second position, nor does it rely on the back‑and‑forth hand‑advancing method. Instead, the date wheel is driven by the instantaneous torque from a dedicated quick-set pusher or a multi‑position crown mechanism – each press of the pusher advances the date forward by one day.
Date Display Position: Date aperture at 3 o‘clock.
Repair Value: The genuine part must be replaced when the date wheel exhibits worn teeth, broken teeth, an enlarged center bore (radial play exceeding 0.02 mm), or when the jumper lacks sufficient positioning torque due to metal fatigue – all of which can cause the date to fail to snap at midnight (landing halfway between numbers), the quick‑set pusher to produce no action, the date window misalignment, or the date disc not to advance at all.
Q1: How can I tell if my date wheel is worn, rather than the jumper spring being the problem?
A: Lift the jumper spring’s pawl and manually rotate the date wheel by one tooth; if the date window does not snap to the center of the numeral, or if the date wheel shifts laterally when unloaded, the date wheel is worn.
Q2: Must I replace the date jumper at the same time as the date wheel?
A: Strongly recommended. A worn jumper pawl will have an asymmetrical contact face that will not seat properly into a new date wheel’s tooth valleys, leading to skipping.
Q3: When is the wear on the date wheel‘s teeth bad enough to justify replacement?
A: Under high magnification, if the tooth flanks have developed a mirror‑polished band (the original satin finish is gone) and the tooth tip has flattened or rolled, replacement is required.
Q4: Which other parts of the quick‑set mechanism could influence date‑wheel wear?
A: The 10 o’clock corrector rod has a small end‑piece that pushes the date driving gear. A bent rod or a deformed push‑piece in the case can cause eccentric force on the gear train. Both should be inspected if date indexing is erratic.
Q5: How should I align the date wheel when installing it myself?
A: Place the jumper spring in its seat but do not yet engage the pawl. Rotate the date wheel so a tooth valley aligns directly under the pawl, then snap the spring into place. You should hear a light click. Finally, replace the cover plate.
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