Clone Caliber A8900 — VSF Edition
The VSF-engineered A8900 clone caliber represents a significant structural departure from traditional decorated Miyota bases, delivering a functional architecture that mirrors the genuine METAS certification standard movement. This specific caliber features a blackened balance wheel and the crucial jumping hour hand complication, allowing technicians to adjust the local time zone independently without hacking the seconds hand or disrupting the minute train. Operating at 25,200 vph, the movement provides a highly stable beat rate, replicating the operational cadence of the genuine Co-Axial escapement.
Encased in 316L stainless steel, the 41mm case features alternating brushed flanks and high-polish lyre lugs, measuring 47.5mm lug-to-lug. The dial presents the signature horizontal teak pattern in a dynamic green sunburst finish, achieved through precise laser engraving. Rhodium-plated hour markers and broad-arrow hands are deep-filled with Super-LumiNova, ensuring optimal low-light visibility against the dark dial, while the smooth mirror-polished bezel sits flush against the domed sapphire crystal.
VSF remains the definitive choice for this reference primarily due to the proprietary A8900 keyless works. While other factories rely on standard quick-set date mechanisms masked by decorative plates, VSF engineered the movement to support the authentic independent hour adjustment, a critical technical parameter for this model.
- Movement: VSF Custom A8900 Clone — Approximately 36 hours
- Case Material: 316L Stainless Steel, 41.0mm diameter, 47.5mm lug-to-lug, ~105g
- Bezel: Smooth 316L Stainless Steel, mirror-polished finish
- Crystal: Domed Sapphire with double-sided AR coating
- Bracelet: Green vulcanized rubber with woven texture, steel deployant clasp
- Water Resistance: 30m stated — professional pressure test recommended before submersion. Do not operate pushers or the crown while submerged.
For collectors who already own the genuine Master Chronometer model, this VSF iteration serves as an exceptional mechanical alternative. The functional parity of the jumping hour hand and the accurate geometry of the lyre lugs ensure the wrist presence and operational feel remain virtually indistinguishable from the OEM counterpart.


















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