About the Zenith Chronomaster Open
The Chronomaster Open traces its concept to Zenith's long-running mission to celebrate the El Primero caliber, widely recognized as one of the first automatic chronograph movements ever introduced, debuting in 1969. The Open designation refers to the signature skeletonized window cut into the dial that frames the balance wheel and escapement, a detail that transforms timekeeping into a live mechanical spectacle rather than a hidden technical achievement. Across its iterations the collection has been produced in both precious metal and steel, catering to collectors who prize horological transparency alongside refined finishing and Zenith's proven chronograph accuracy. Boutique Edition variants, such as the blue-dial 03.3300.3604/51.M3300, extend the range with exclusive colorways available only through select authorized channels.
What to Look For
Buyers comparing Chronomaster Open references should note that the reference suffix encodes key differences: bracelet codes beginning with M indicate a metal bracelet while C codes denote a leather strap, and dial color codes such as /69 for silver, /21 for black, and /51 for blue appear mid-reference. Rose gold models, including the 45 mm 18.1260.4021 chronograph and the 39.5 mm 18.3300.3604, command a premium over steel equivalents and appeal to collectors seeking precious-metal presence alongside the open-dial complication.
Frequently Asked Questions
What makes the Zenith Chronomaster Open different from a standard Chronomaster?
The defining feature of the Chronomaster Open is the cut-out aperture in the dial that reveals the El Primero movement's balance wheel beating at high frequency, offering a live view of the escapement that a closed dial conceals. This open-worked window is paired with a fully functioning column-wheel chronograph, making the watch both a technical showcase and an everyday complication.
Are the Zenith Chronomaster Open watches at Bizak and Co. new or pre-owned?
Bizak and Co. carries both brand-new and pre-owned Chronomaster Open examples, with several references such as the steel 39.5 mm silver and black dial 03.3300.3604 models listed explicitly as brand new. Each watch is authenticated before listing, and availability across dial colors, case materials, and strap configurations is noted individually on each product page.
Which case size and material should I choose when buying a Chronomaster Open?
The 39.5 mm case is the more versatile everyday size and is available in both stainless steel and 18-carat rose gold, suiting a wide range of wrist sizes and dress codes, while the 45 mm rose gold reference offers a bolder, more statement-oriented chronograph presence. Steel references generally offer stronger value retention for entry-level buyers, whereas rose gold editions appeal to collectors prioritizing precious-metal rarity and aesthetic warmth.
Buy, trade, or sell. Contact Bizak & Co. for pricing and availability on any reference in this collection.
