The Zenith DEFY Skyline Chronograph 160th Anniversary Edition (Reference: 49.9502.3600/51.I001) is an exceptionally rare, highly coveted luxury timepiece limited to only 160 pieces worldwide. Released to celebrate the manufacture's landmark 160-year milestone, this striking 42mm model commands extreme desirability on the secondary market due to its unique "electric" blue ceramic build and immediate sell-out status.
  Because all 160 units sold out instantly upon boutique release, locating a "Like New" or "Mint" condition example is a prime find for collectors.  
  When purchasing or validating a listing in this condition, ensure that the timepiece comes complete with its anniversary-specific premium presentation packaging (featuring the 160-year emblem), the extra blue rubber strap, spare ceramic links, and the official Zenith international warranty paperwork. Given its ceramic composition, check the faceted edges closely; while incredibly scratch-resistant, ceramic can chip if subjected to hard impacts.

• Case & Bezel: 42mm diameter, 12.7mm thickness, and 47.4mm lug-to-lug. It features an architectural octagonal case with a faceted 12-sided (dodecagonal) bezel made entirely of vibrant blue ceramic. 

• Movement: Powered by the legendary in-house El Primero 3600 automatic high-frequency calibre (operating at 5Hz / 36,000 VpH). It provides a 1/10th of a second chronograph function, where the central hand completes a full revolution every 10 seconds. 

• Dial Aesthetic: Rich blue sunray dial adorned with an engraved geometric four-pointed star motif. It features a date window tucked tightly at 4:30, rhodium-plated Super-LumiNova markers, and three overlapping snailed sub-dials. 

• Strap System: Comes standard on a matching full-ceramic integrated bracelet. It includes a case-integrated quick-change system to effortlessly swap it out for the bundled starry-sky-textured blue rubber strap with a steel folding clasp.

• Durability & Mechanics: Features a 60-hour power reserve, a screw-down crown, and 100 meters (10 ATM) of water resistance. The sapphire crystal caseback showcases a special rotor decorated with the "160th Anniversary" engraving.