Zenith
Zenith is one of the oldest watch companies, est. 1865 and one of only a handful which still produces all its own mechanical movements today. The company has an almost unparalleled record of technical achievements. Notably, in 1929, Zenith won world renown at Kew Observatory (England), when a Zenith wristwatch won first prize for accuracy of better than 0.6 seconds per day.
During the late 1940s and throughout the 1950s, Zenith held the lead in producing many of the most commercially successful and most advanced chronograph wristwatches. The technical expertise and craftsmanship which went into these was watches immense. Just a brief look inside the case-back of any chronograph is enough to demonstrate how complicated these watches are – making them very expensive to design and produce.
Zenith has also been recognised with more than 1500 awards and has over 50 individual movement designs to its name, making it the Swiss brand with the most awards for precision.
Why This Watch Is Important
Put simply, in 1969 Zenith produced the world’s first automatic chronograph, the El Primero. This movement was a tour de force and so advanced that 20 years later in 1988, when Rolex required a more advanced movement to install in its Daytona Chronograph, it chose to fit the Zenith El Primero movement. It then continued to do this right up and until the year 2000 when Rolex finally began to make its own chronograph movements for the Daytona for the first time.
Many see this as one of the best chronograph movements ever produced, as it can accurately measure time to 1/10th of a second and even today very few chronographs are capable of achieving this.
In 1991, Zenith introduced its first Triple Calendar, Moonphase, Chronograph by adding these functions to its self-winding El Primero Chronograph movement. This fabulous timepiece is one of the rarer 18ct Pink Gold cased examples. This is historic piece and one of the most fabulous calendar chronographs ever produced. This is also a true ‘time capsule’ piece, by which we mean it has seen little to no real use and has been kept in mint condition.
Given that many more expensive brands offering inferior chronograph movements charge far more for their hand wound chronographs with calendar and moonphase functions, this Zenith El-Primaro automatic in 18ct Pink Gold offers truly excellent great value for money.
The Stats
Seven Functions:- 1) Chronograph accurate to 0.10 sec, 2) Day, 3) Date, 4) Month, 5) Quickset, 6) Moonphase, 7) Self-Winding Automatic movement.
Chronometer grade timekeeping.
Model Ref 17 0240 410 Calibre 410Z, Produced 2008. This example first sold in 2008.
Rare 18ct Pink Gold example.
The Dial
The original silver-white guilloche dial contrasts wonderfully with the 18ct pink gold case and original pink gilt ‘dauphine’ hands and matching 1 – 12 Roman Numerals. It is beautifully symmetrical, well balanced and proportioned. It may initially look quite complicated, but this is because it conveys a lot of information. In actual fact, it successfully conveys all this information very simply, once you become familiar with the layout.
The dial carries the classic triple date design, to which many watch houses adhere. The window to the left hand side by 10, indicates the day of the week and the window to the right hand side by 2, indicates the month of the year. The watch also carries the Moonphase in the lower half of the dial.
The subsidiary dial at 3 counts elapsed minutes, up to 30, while the chronograph function is running and the subsidiary dial at 9 counts seconds irrespective of if the chronograph is running.
The dial carries a outer tachymeter scale and a black seconds scale divided into fifths of a second. The tachymeter scale measures speed based on time travelled over a fixed distance, i.e. as a rangefinder – typically in a military application; especially naval gunnery and anti-aircraft artillery – or to measure how far away a storm is, by using the difference in time between the arrival of a flash of light and its associated sound.
This is the original dial which remains fully original, unrestored and untouched yet remains in immaculate condition.
The Movement
As mentioned above, the El Primero movement was a ground breaking achievement for Zenith. First launched in early 1969, it was not only the world’s first self winding chronograph but it also accurately measured time to 1/10th of a second, and included a quickset date function.
This watch carries the automatic calibre 410Z movement which is rhodium-plated. It’s constructed with 31 jewels, a shock absorber mechanism, and a straight-line lever escapement. Included is a monometallic balance that’s adjusted for heat, cold, and 5 positions, a self-compensating flat balance spring, and a micrometer regulator.
As mentioned elsewhere on our website, it is very important when considering a triple calendar chronograph to find one in tip-top condition which has been well cared for and properly serviced. This is just such an example with each of its functions working perfectly.
The calendar function is simply set as follows. First rotate the hands to the lower part of the dial close to the six. This is important and ensures the movement itself is not trying to, or is about to try to, advance the date. The moonphase can be advanced by using the pusher at eight o’clock. The day of the week is then set by gently pressing the lower pusher on the outside of the case by 7. The date and month are then set by pulling the crown out to its most fully extended position and rotating it. Finally, the time should then be set in the normal way before then ensuring the watch is then fully wound.
The chronograph function works in the usual way and is started and stopped using the top right hand button. It is then reset using the bottom right hand button.
Please note – it is important not to leave the chronograph timer function running in normal use as this will cause unnecessary wear on the chronograph parts of the movement.
The El Primero remains the only mechanical movement ever able to measure time intervals to within a tenth of a second. In fact this 31 Jewel movement was so advanced and such a technical tour de force, that when in 1988 Rolex decided to replace its ageing hand-wound Valjoux Cal.72 movement in its Rolex Daytona chronograph with an automatic movement, it chose to buy and fit the Zenith El Primero movement. Rolex then continued to use this movement until the year 2000 when it finally began to produce its own chronograph movements.
As expected, the movement of this watch is in first class condition and has been fully overhauled and serviced by our vintage chronograph specialist master watchmaker. This involves complete disassembly of the movement to each of its component parts. It was then cleaned and closely examined under high magnification, then re-assembled using only the correct Zenith replacement parts where necessary, and specified oils and adjustments as required, before final testing, and calibration.
Following careful timing and calibration, this watch is currently running within +2 seconds per day which is absolutely outstanding! This movement also has a 50-hour power reserve when fully wound. We are therefore more than pleased to offer 12 months’ warranty on this watch movement*.
The movement is correctly signed ‘Zenith El Primero’, ‘Swiss Made’ and ‘Manufacture Le Locle’ and with the Calibre No 410Z and the movement serial number 184390.
*Please note – our 12 months’ warranty is only applicable if the full list price is paid.
The Watch Case
The substantial 18ct pink golf watch case measures 40mm in diameter, excluding the original Zenith signed winding crown. This wonderful watch weighs an outstanding 90 grams. The case is in almost perfect condition with no evidence of anything other than careful use and very gentle hand-polishing. It is completely scratch free and the lugs are sharp, with almost new edges. The chronograph pushers are also in immaculate condition, indicating the watch has seen very little use.
The case-back is of full thickness and shows no signs of wear visible to the naked eye. The outside of the case back is correctly signed ‘Manufacture Zenith’ and ‘Chronomaster’ with the model number 17 0240 410 and is signed ‘750 Swiss Made’ to show the watch is 18ct solid gold.
As ever our standard advice applies: Vintage watches should be kept clean and dry at all times.
Operation
Although this watch has many functions it is very easy to set and operate.
As ever with all watches with Triple Calendar functions it is essential to only ever attempt to alter the settings while the hands are in the lower half of the dial, away from automatic date change at midnight. Otherwise damage can be caused to the automatic date change mechanism. The day and moonphase are changed using the bottom and upper left hand pushers respectively. It is best to use a toothpick to operate the pushers. The date and month are set by pulling the crown out to its second position. In this position the date can be advanced very quickly by rotating the crown clockwise. The month advanced by advancing the date by 31 days.
The top right hand button is used to start and stop the chronograph. The bottom button is used to reset the chronograph. During the operation of the chronograph, the right-hand register measures elapsed minutes up to 30 minutes while the bottom register measures elapsed hours, up to 12. The left-hand register counts constant running seconds, independent of the chronograph function. Please note, as ever it is important not to leave the chronograph function operating while the watch is in normal use as this causes unnecessary wear on the chronograph section of the movement.
The Strap & Buckle
This watch currently has a genuine XL* Zenith brown leather strap fitted, in almost unused condition and this watch has also been fitted with the Original 18ct pink gold Zenith buckle. However, if a different colour or style of strap is preferred, please let us know and we will do our best to oblige free of charge. We carry tan, conker, dark brown and black in stock in plain padded leather, crocodile skin or lizard skin. We can also obtain most types and colours from our partners at ‘Watch Obsession’ within 48hrs. Please take a look at their huge range of straps if you wish here.
*Note the strap currently fitted is an extra large genuine Zenith Alligator leather strap in tan colour.
Box and Papers
This watch comes complete with the original Zenith booklet, as shown in the photographs, which dates this watch correctly to 2008.
Detailed particulars will be included with our purchase receipt for your interest and security. A separate insurance valuation for the replacement value of this watch will be provided at the time of sale along with our unique ‘Lifetime Authenticity Guarantee’ which states: “If this watch proves to be anything less than 100% genuine, authentic and original, a full refund will be given at any time”.
The original matching Zenith presentation box shown in the photographs is included.
Payment and Delivery
If you would like to pay by bank transfer, we will be pleased to assist you with this. Similarly, if you wish to pay by International SWIFT or Bank Wire Transfer we will provide you with our BIC / Swift number and our IBAN number.
Please check the import duties and any taxes your government may apply, these are different for each country and, unfortunately, out of our control.
We understand there may be some ‘loopholes’ that may help you avoid these charges; however, attempting to use these could impact our ongoing ability to serve our growing international customer base.
For those who happen to visit London on occasion, we are, of course, more than happy to store your watch until we can meet you in our offices in Kensington, London, and hand your watch directly to you there.
As with all our watches, this watch will be sold under our 14 days no-quibble sale or return policy.
In Conclusion
This is truly one of the most magnificent and important watches from one of the absolute leaders in its class. We think the value of this watch is excellent given the market for important rare vintage gold watches in recent years.
A word on our prices – We always try our hardest to acquire the very highest quality watches we can find, before restoring them to the highest possible standards. We then offer these at the fairest prices we can, taking into account our pre and post-sales care and service. This approach means we will never be the cheapest, but nor will we be the most expensive. Indeed there are some well-known stores in West London which are highly successful charging between two to three times the price you see here. We, therefore, consider our prices to be fair, given the quality of watches we have to offer.
Please note, we also welcome part exchanges. If you have a watch or a small collection for sale, please contact us as we will be happy to discuss this.
We will also be happy to Service your watch, Repair your watch or Restore your watch, all at ‘sensible’ prices. Please see here.
If you have any questions please call us on 020 7727 7095 or if calling from overseas on +44 207 727 7095.
Please take a look at our other fine vintage gold watches.
Thank you.
Andrew M via feefo 
3rd December 2024 
JLC1891 
