Model Reference
ZENITH EL PRIMERO 51.2161.4047/75.C713
Production Years:
The ZENITH El Primero Chronomaster Open Grande Date 51.2161.4047/75.C713 is part of an older version of the Chronomaster range which has been discontinued. The reference was in production sometime around the 2010s, even though the exact years of introduction and manufacture cannot be determined for the specific model. The 51.2161.4047/75.C713 is part of the era where ZENITH started to make the mechanics behind their chronographs visible through transparent parts of the dial which show the mechanism which would otherwise remain hidden within the case. Although the El Primero movement is from 1969, the 51.2161.4047/75.C713 is quite a recent watch built on that technology base. For buyers of used ZENITH watches, this particular reference has a certain unique feature which is not present in the simple Chronomasters.
Defining Features
There are many things going on inside the brown face of the Chronomaster Open Grande Date but there is a definite purpose behind the design. A certain area between 8 and 11 o'clock on the dial has been removed to give us a glimpse into the regulating system of the movement, and allows us to see the balance wheel assembly functioning through the opening. There is a metal rim surrounding the opening held together with screws, thus giving the mechanical view its own defined space. The large date window can be found above the centre of the dial, close to 2 o'clock, while the 30 minute chronograph counter is placed on the right hand side of the dial.
The watch has a stainless steel 45mm case that is accented with rose gold crown and chronograph pushers, giving it a touch of metallic warmth to the design that comprises mainly brown and steel. Its hour markers and faceted hands have luminescent features, while its tachymeter scale is found around the periphery of its face. Sapphire crystal protects its front, while its back is transparent. It came in a brown alligator leather band that is secured with a folding clasp. With an estimated thickness of 15.6mm, this is quite a hefty watch.
About Zenith El Primero 51.2161.4047/75.C713
El Primero Calibre 4047 is essential for understanding this watch because it needs to provide the required functionality of the various displays while still providing high frequency that comes from that line of movements. It has a frequency of 36,000 vibrations per hour, which corresponds to 5Hz, and features automatic winding with a power reserve of about 50 hours. The chronograph movement works using a column wheel, which controls starting, stopping, and resetting of the chronograph function. In addition to that, the watch movement provides functionality of a large date and day/night indication. The balance on the dial is not only for decoration but rather is part of the regulating system.
The large date needs special mention. Rather than using the standard single date disc that can be seen in most automatic watches, ZENITH opted for a more sophisticated display which shows the date in a bigger format. Its placement at the 2 o'clock position ensures that the date is independent of the opening in the dial. Another mechanical display is provided by the day & night indicator beneath the central hands. It is important to note that the display is not an astronomical moon phase, but merely a device to distinguish day from night in the 24-hour movement cycle.
As an entire watch, 51.2161.4047/75.C713 stands for a time when ZENITH could afford to dress up its chronographs more luxuriously but still keep the basics of the El Primero alive. The brown dial, exposed balance wheel, calendar displays, and metal details – all of these features define the specific design of the watch. This is why the model needs to be examined separately in terms of secondhand trade due to the importance of the state of the open dial, movement, and originality of the parts.
At a Glance
- 45mm Case
- Steel & Rose Gold Case
- Leather Bracelet
- Automatic Movement
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Why Buy a Pre Owned ZENITH El Primero 51.2161.4047/75.C713?
The pre-owned ZENITH El Primero 51.2161.4047/75.C713 is a sophisticated chronograph that combines striking design with exceptional Swiss watchmaking. Its substantial 45mm stainless steel and rose gold case, rich brown dial and distinctive open-heart display offer a fascinating glimpse into the movement beneath. Powered by the legendary high-frequency El Primero Calibre 4047, it delivers impressive chronograph precision and a 50-hour power reserve. Additional features include a large date display and a day/night indicator, adding both practicality and visual interest. Paired with a brown leather strap, this Chronomaster strikes an appealing balance between sporty character and refined elegance. For collectors seeking a distinctive luxury chronograph with serious horological pedigree, this ZENITH is an excellent choice, particularly on the pre-owned market.
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Why Choose BQ Watches for a Pre Owned ZENITH El Primero 51.2161.4047/75.C713?
A complicated chronograph deserves more attention than a quick inspection of its case and strap. On this reference, the exposed balance assembly should be examined alongside the chronograph operation, large date and day and night display. The rose gold components, dial opening, case surfaces and leather strap can also reveal how the watch has been used and maintained. When you buy a pre owned Chronomaster through BQ Watches, the condition and specification of the individual watch are important parts of understanding what is being offered.
For an existing owner, the combination of complications, discontinued reference and original configuration makes a model specific valuation particularly useful. A watch retaining its original clasp, documentation and evidence of servicing may present differently from another piece with the same reference number but a different ownership history. BQ Watches can also consider the Chronomaster as part of an exchange towards another luxury watch. If you are planning to sell, the assessment can take account of the watch's condition, movement, accompanying items and current market demand rather than relying on the historical retail price.
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