DeBethune DB15WT Perpetual Calendar White Gold

More about DB15WT Perpetual Calendar White Gold

This is an 18k white gold De Bethune Perpetual Calendar DB15WT. It has an alligator leather strap with an 18k white gold tang buckle, and scratch resistant sapphire crystals with 1800 Vickers hardness and double anti-reflective coatings. It includes a pull out three-position winding crown with a quick-date adjustment, and two correctors at 8 and 10 o'clock on the left-side case band for adjusting the perpetual calendar function. There is an exhibition sapphire display case back secured with 7 screws, and it's engraved with "DE BETHUNE – SWISS MADE," hallmarks and serial numbers. The 43mm diameter solid three-body case, bullet-shaped sculptural ogival lugs, and convex bezel, are polished. The dial is two-tier Satine silver with blue painted Roman numeral hour markers around a perimeter blue railway-style minute scale. It has blue feuille hands, and twin aperture windows at 9 and three o'clock for the day and month, respectively. There is a radial date indicator with blue Arabic numerals and a blued indicator hand, and the revolving platinum spherical moon display with a leap year indicator (shown by the eclipse of a star below the moon) spins around its own axis. It has a 100-hour (5-day) power reserve at full winding, and it's water resistant to 30 meters/100 feet. The 12mm thick case, dial, and movement are all signed. This De Bethune Perpetual Calendar DB15WT has a mechanical manual winding caliber DB 2004-120 movement. It's rhodium-plated, with cotes de Genève embellishment, and it's constructed with 27 jewels, self-regulating twin-barrels mounted in series, and a triple pare-chute anti-shock system. It includes a high-frequency straight-line lever escapement, a patented special 3-spoke titanium balance with platinum ogival weights, and a self-compensating free sprung flat balance spring with a flat end-curve. The mechanism oscillates at a frequency of 28,800 vph (4 Hz). The De Bethune Perpetual Calendar DB15WT was introduced in 2015.

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