• Brand: Tudor • Model: Heritage Black Bay Steel 41 Chronometer (COSC) Certified , In "Excellent" condition. Like New. All functions work perfectly. "Very Classy, Exclusive and Prestigious Model. Striking and Eye-Catching. From Tudor's Most Popular Series, Black Bay." • Reference Number: 79730 • Movement: Automatic, Works perfectly. Impeccable at timing. Tested on Timegrapher. > Tudor MT5612 In-house Movement > Power Reserve: 70 Hours > Chronometer (COSC) Certified Movement In order for a watch to put the term Chronometer on its dial, it must pass the Official Swiss Chronometer Testing Institute, namely the COSC. To measure the movement and precision of a watch, COSC places it at different temperatures and inspects it for days under varying conditions. The result should be no more than -4 or +6 seconds of deviation per day. Of course, this is not an easy thing to achieve. So much so that only 3% of the Chronometer watch models produced in Switzerland can get a certificate. • Crystal: Sapphire, Scratch free. In Excellent Condition. • Anti-reflective coating on the crystal • Swiss Made, Fully Original • Case & Bracelet: Stainless Steel • Dial: Black , In "Excellent" condition. Spotless. • Luminious hands and markers • Case Diameter: 41 mm. (Excl. Crown) • Wrist Size: 19 cm. • Screw-down lockable crown • Crown: Original Tudor • Uni-directional Rotating Bezel • Folding and Lockable Clasp • Bracelet: Original Tudor • Clasp: Original Tudor • All functions work perfectly. • The watch is in "Excellent" condition. There is no scratch on the glass. It is as seen in the photos. Very Classy, Exclusive and Elegant model. • Shipping: FREE • Registered and Insured Shipping with Tracking Code in 1-3 days.