Following the physically twisted Rolex Daytona setup that made its presentation in the mid 1960s, Rolex divulged the programmed Daytona assortment in 1988. Gone were the Valjoux-based hand-twisted developments within the Rolex Daytona for Zenith El-Primero-based self-winding developments. The lovingly nicknamed ‘Apex Daytona’ watches were around for a very long time until Rolex at last presented an assortment of programmed Daytona watches controlled by their first in-house chronograph movement.
right away, the two ages of the programmed Daytona appear to be identical, both after comparable plan diagrams. However, after looking into it further, the Daytona dial uncovers which development lies inside the watch – which is commonsense given that Rolex observes never come with a straightforward presentation caseback. In case you’re uncertain how, read on to figure out how to recognize a Zenith development inside a Rolex Daytona by taking a gander at the dial.
Rolex Caliber 4030 versus Type 4130
The primary cluster of programmed Daytona watches housed the Rolex Caliber 4030, which depended on the El-Primero Caliber 400 by Zenith. Type 400 was, indeed, a revival (brought back in 1985) of the spearheading Zenith El-Primero Cal. 3019PHC produced using 1969-1975. You may review that Zenith was one of the main watchmakers (it’s an on-going discussion in the watch world concerning who can really guarantee the title of the absolute first) to create a self-winding chronograph development in 1969.
Although the Zenith Caliber 400 was an incredible self-winding chronograph development, Rolex did intensely adjust it as per the necessities of the Daytona. After totally was said and done, just about half of the first base remained. The absolute most important alterations included lessening the recurrence rate from 36,000 beats each hour to 28,800bph, eliminating the date work, and adding another escapement with a Breguet overcoil. The Caliber 4030 utilizations a horizontal grasp chronograph framework and has a 54-hour power save. Apex Daytona watches have five-digit reference numbers (165xx) and were created from 1988 until 2000.
It took Rolex five years to build up the in-house Caliber 4130, which made its presentation in 2000 inside the new age Daytona watches with six-digit reference numbers (1165xx). Compared to the 4030, the Caliber 4130 gave extraordinary enhancements regarding execution, power save, and serviceability.
First of all, in direct difference to its archetype, Caliber 4130 utilizations a vertical grip chronograph framework. This framework not just allows the chronograph to run for extensive stretches with no effect on the watch’s timekeeping exactness, yet it additionally disposes of the unsteadiness of the chronograph hand when it begins/stops/resets. Rolex additionally expanded the size of the fountainhead barrel inside the 4130 to supply an expanded 72-hour power reserve.
Additionally, Rolex decreased the quantity of parts inside the development to encourage adjusting. Just about twenty years after it was first delivered, the in-house Rolex Caliber 4130 actually remains as extraordinary compared to other self-winding chronograph developments made.
Zenith Daytona Dial Differences
As chronographs, both the Caliber 4030 and the Caliber 4130 Daytona models have a threesome of auxiliary dials on the dial in the recognizable 3, 6, and 9 o’clock design. In any case, looks-wise, the request for the sub-dials is the thing that recognizes the Zenith Daytona from the in-house Daytona.
On the Zenith Daytona watches, the 30-minute counter is situated at 3 o’clock, the 12-hour counter is situated at 6 o’clock, and the running seconds is situated at 9 o’clock. On the in-house Caliber 4130 Daytona watches, the running seconds is situated at 6 o’clock and the 12-hour counter is situated at 9 o’clock – those two sub-dials exchanged positions while the 30-minute counter stayed in its unique location.
So the snappiest method to recognize a Zenith development inside a Rolex Daytona by taking a gander at the dial is verifying whether the running seconds is to be sure at 9 o’clock.
The Zenith Daytona observes likewise have slimmer hour markers than their replacements, and the position of the three registers is more focused compared to the somewhat helter-skelter arrangement of the later Daytona ref. 116xx models. At last, the sub-dial rings on the tempered steel Zenith Daytona ref. 16520 are dark on the white dial forms and grayish on the dark dial adaptations while silver rings are utilized on the resulting hardened steel Daytona ref. 116520.
There you have it, a straightforward method to recognize the early Zenith Daytona watches from the later in-house development fueled Daytona watches without opening up any casebacks!