Zenith Class T Open Silver Dial

More about Class T Open Silver Dial

This is a stainless steel Zenith, Class T Open 03.0510.4021/01.C492. It has a leather strap with a stainless steel double fold-over deployment buckle, and a scratch resistant sapphire crystal. There is an exhibition sapphire display case back secured with 8 screws, and engraved with "ZENITH CLASS – WATER RESISTANT 50M – STAINLESS STEEL – SWISS MADE," and the reference number "03.0510.4021." It has rounded rectangular chronograph pushbuttons, and the 40mm diameter solid three-body case, downturned lugs, and angled bezel are polished/brushed. The dial is white with applied faceted dart hour indices, and applied Arabic numeral hour markers at 2, 4, 6, 8, and 12 o'clock. It has blued baton hands, a center sweep seconds chronograph hand, and a perimeter minute/second scale. There is a circular cutaway with a steel "gasket" rim in the dial between 10 and 11 o'clock that exposes the escapement. Interposed on this and part of the gasket is the running seconds counter at 9 o'clock. It has a brushed steel 60-minute totalizer at 3 o'clock, and both sub dials have skeletonized white "film reel" centers. There is a 50-hour power reserve arc between 4:30 and 7:30 o'clock, with a skeletonized rose gold indicator hand. It has a Certified Official Superlative Chronometer (COSC) rating. It's water resistant to 50 meters/165 feet, and the 16mm thick case, dial, and movement are all signed. This Zenith, Class T Open 03.0510.4021/01.C492 has a mechanical El Primero caliber 4021 column wheel chronograph movement. It's rhodium plated with fausses cotes embellishment, and it's constructed with 39 jewels, 248 components, and a shock absorber device. It includes a silicon straight-line lever escapement, a self-compensating flat balance spring, a silicon escape wheel, and a monometallic balance that's adjusted to 6 positions. The mechanism oscillates at a frequency of 36,000 vph (5Hz).

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