Modified 8215 Movement | Tourbillon-Style OEM Manufacturing

Modified Miyota 8215 Accuracy and Power Reserve Standards

Drawing inspiration from proven Japanese mechanical architecture, we engineered this modified Miyota 8215 caliber for stable daily performance. Specifically, in-house testing confirms rate accuracy within -20 to +40 seconds per day when measured 10 to 60 minutes after full winding. Simultaneously, applying approximately 40 manual turns on the crown fully charges the mainspring to achieve a 42-hour power reserve. Consequently, the caliber provides consistent rate stability across everyday wearing conditions.

Open-Worked Balance Wheel Display and Finishing Details

Where standard Miyota 8215 movements remain fully covered, we re-engineered the mainplate with an open-worked balance window inspired by classical tourbillon layouts. Therefore, the regulating organ, gold-toned gear wheel accents, and heat-blued steel screws remain visible during operation. In fact, we apply a uniform brushed metal finish across the plates to reduce surface reflection. As a result, the modified architecture presents clean mechanical contrast through front dial apertures or transparent casebacks.

Radial Sunburst Plate Engraving and Ruby Bearings

Meanwhile, a radial sunburst pattern engraved across key movement bridges highlights the primary gear train and synthetic ruby bearings. Additionally, these ruby jewels reduce internal friction along key friction points to support long-term mechanical longevity. Simultaneously, the 21,600 vibrations per hour (3 Hz) frequency ensures steady gear interaction during continuous operation. Turn the movement over, and our quality control team inspects every modified assembly for winding torque and operational tolerances.

Bespoke Supply and Private Label Production

Ultimately, as a specialized watch manufacturing facility, we offer full-scope OEM and ODM customization options, including custom logo execution, rotor engraving, or specialized movement finishing for your brand.