An in-depth look at Zeitwerk Lumen

a lange sohne zeitwerk luminous lumen phantom 140.035 rare special edition platinum review
Zeitwerk Lumen Phantom. The coolest watch, ever.

Following its groundbreaking re-birth in 1994 with astonishing pieces such as Lange 1 and Tourbillon Pour le Mérite, A. Lange & Söhne successfully signalled that it came back for the highest echelon of watchmaking. Such a claim was apparently not for nothing as the brand cemented its place even further with pieces like Datograph in 1999, Double Split in 2004 and Tourbograph in 2005 both in terms of complications and overall characteristics.

Yet, A. Lange & Söhne was a late comer to the market. After more than 50 years of exile, there was no recognition for the brand other than few connoiseurs, mainly from German Speaking countries. Hence, Lange had to climb-up the so-called product ladder in people’s minds and the way to do this was differentiation.

Albeit exceptionally characteristic and technically superb, the pieces mentioned above were within the boundaries of what we think as a mechanical watch. Even though each had a unique appearance; they were still looking like mechanical watches. They were conversational, but only within the collectors’ circle and for those who really know.

Then came something that I refer to as the second re-birth of A. Lange & Söhne in 2009 – the Zeitwerk. And this one here is the ultimate version of the celebrated line: Zeitwerk Lumen Luminous (140.035) or a.k.a. the Phantom.


Every brand needs a conversation piece. It has been the Nautilus for Patek Philippe for sometime, 11:59 for Audemars Piguet, Richard Mille himself for Richard Mille etc.. Although Lange produced some conversational pieces the conversatin was almost purely around mechanics or wearability or thickness etc. but not out of the perceived image or the looks. A controversy as “this is not Lange” was not heard – until 2009.

A Lange SOhne Zeitwerk Lumen Phantom platinum special edition black dial 140.035 and yellow gold 140.021 side by side
Courtesy of my dear friends @rroberto2006 and @seikiarai. Yellow gold (140.021) vs the Phantom (140.035)

The launch of Zeitwerk was indeed worthy of a conversation. As the veteran product development director of A. Lange & Söhne repeatedly told me: It is (controversy) something you want. Of course it was hard to take critiques but you have to stand up for theproduct and your team. There was controversy, albeit that was something we wanted and expected. As M. Porter says, if your product pleases everyone, you do not have a strategy. In this regard, Zeitwerk was a first from Lange, it was the outlier.

Acquired taste is the best taste says connoisseurs. True that not long after, many recognized Zeitwerk – and today the collection has its name written next to the icons; Lange 1 and Datograph. The calculated risk paid off handsomely and introduced A. Lange & Söhne to a clientele that was never into the brand before while not alienating the base it already had.

Lange was quick to fan the flame and only after some months after the initial release, the watch for Batman arrived. The Zeitwerk Lumen Phantom, reference 140.035 is limited to 100 pieces and made of platinum.

Zeitwerk Lumen Phantom

Zeitwerk Lumen measures the same as its patriarch – a proportionate, comfortable and solid 41.9 mms in diameter and 12.6 mms in thickness. The tasteful composition of strangeness starts with the case – namely the crown at 2 o’clock. Such arrangement is a result of the movement architecture that brings Zeitwerk to life, as the balance wheel occupies the usual 3 o’clock position. Due to its size, it is very easy to operate.

The case architecture is typical A. Lange & Söhne – three body as the polished caseback ring, brushed case band and polished bezel. The brush in between mirror polished surfaces delivers a much needed contrast as well as a visual illusion by relatively hiding the thickness. As usual, the lugs are notched at the base, mirror polished and superbly detailed on edges. Furthermore, lugs’ curve tremendously increases the comfort and Zeitwerk Lumen hugs the wrist just nice.

A Lange SOhne Zeitwerk Lumen Phantom platinum special edition black dial 140.035 case structure review
Please note the notched base of the lugs as well as the gap between the sapphire and discs. Source: Lange Uhren GmbH.

The real treat with Zeitwerk Lumen however is unquestionably the dial. Its ancestor was a home run itself – a cool watch from Lange for the first time. But somehow, this manufacture from the modest town of Glashütte managed to make it even cooler. To me, this is the most badass and defiant watch ever created by A. Lange & Söhne.

There were two intentions while designing the Zeitwerk: 1) Creating an analog-digital watch. 2) Doing this by placing the discs side by side. The idea of placing indications horizontally goes back to IWC’s Pallweber in the 19th century but A. Lange & Söhne is the first to master such execution, overcoming all of its aesthetic and technical challenges.

The most striking design element of the deceptively simple dial are the windows; which is the modern interpretation of the famous 5 Minute Clock in Dresden’s Semper Opera House made by Ferdinand Adolph Lange and his tutor and then father-in-law Gutkaes in 1841. Zeitwerk Lumen’s layout is a lesson on bringing a traditional element from 150 years ago and adapting it to modernity.

Zeitwerk Lumen was introduced in 2010 and it is the first piece of the Lumen collection of A. Lange & Söhne. According to Anthony De Haas, the idea came at night while he was trying to read the time on Zeitwerk. Alas he could not – simply because Zeitwerk has no lume spots. The only possible solution was to lume up the discs. However, since the discs change frequently (60 seconds for minute disc, 10 minutes for decimal and so on) there was no time to charge up the lume. Thereby the idea of charging the discs while they’re hidden beneath the smoked sapphire arrived.

a lange zeitwerk lumen luminous phantom 140.035 sapphire dial explanation
Source: Lange Uhren GmbH

The smoky sapphire glass acts as a reversed sunglass and allows only UV rays to pass. As the SuperLumiNova charges throughout the day with UV, it creates an enticing glow in the dark. The German Silver time bridge is coated in black – creates a very strong visual harmony. Especially at night, with the lume coming alive, the contrast between the black and green is a sight to behold.

The disc jump is so fast and accurate; one wants to meet with the watchmaker and hand over a medal for the meticulous adjustment. If you blink, you lose it and you have to wait for the next minute. What is more fascinating, this accuracy never fails. No wonder the Zeitwerk has its own special department and purposefully trained watchmakers within the manufacture.

Caliber L043.3 (not the L043.1 as the basic version) of Zeitwerk Lumen does not house any technical differences from its predecessor. It is still the same exceptional movement beating at 2.5 Hz, boasting 36 hours of power reserve and a patented remontoire mechanism blessed with a unique architecture and a myriad of expertly applied finish techniques.

Since understanding the mechanics of Zeitwerk would tremendously increase the joy you’re going to get from it, I’d like to walk you through its working principle:

a lange zeitwerk lumen phantom 140.035 platinum caliber l043.3 review
L043.3. Source: Hodinkee Talking Watches with Tony Fadell.

As known, the mainspring barrel provides the power to run the watch. In a common watch with hands, since the hands do not require as much power as huge discs, the barrel houses a regular, rather short and thin mainspring. Zeitwerk on the other hand, carries the thickest mainspring that A. Lange & Söhne produces the strongest torque due to the tremendous amount of power needed by discs. As our favorite comic book Uncle, Ben Parker says, with great power comes great responsibility and the responsibility here is on the shoulders of the remontoir mechanism.

A remontoire (meaning “to wind” in English) is a small secondary source of power, a weight or spring, which runs the timekeeping mechanism and is itself periodically rewound by the timepiece’s main power source, such as a mainspring (The definition from Wikipedia) The constant force mechanism, delivers equal torque every minute to create that magical disc jump; 1608 times a day.

A Lange Söhne "Zeitwerk" caliber L043.1
Source: Lange Uhren GmbH

So, it is important to understand the following two concepts:

  • The power coming from the mainspring is too much for the balance system to handle. Therefore, the constant force escapement releases an optimal portion for the watch to work.
  • The third wheel in regular watches sits between the center wheel (minutes hand) and fourth wheel (seconds sub-dial) and arranges the corresponding gear ratio.

Here, I quote from Peter Chong’s reference article:

“The mechanism works by blocking the power from the mainspring at the lower third wheel and using the remontoir to run the rest of the train from the upper third wheel to fourth wheel, escape wheel and eventually the balance wheel. The remontoir provides power to the escapement when the lower third wheel is blocked, and once a minute, the lower third wheel is released. During this release, the mainspring snaps it forward for one revolution, only to be blocked once again. In this process, it recharges the remontoir and also drives the disc mechanism”

Furthermore, every minute, the constant force mechanism releases enough energy to move all three discs; but, this creates another problem. Because, only once in every hour the watch needs such energy. So, what to do with the rest? There comes another ingenious solution called windflüge (wind break), a part resembling a revolving door which can be seen beneath the last jewel bearing of the remontoire bridge. The wind break starts to turn upon the tension release and dumps the rest of the energy by using friction – hence completes the marvel taking place every minute.

Zeitwerk caliber L041.3 REMONTOİRE unwind mechanism
The first slight move is the so-called “pre-arming” and the second is the jumping of the discs

Visually, the caliber L043.3 of the Zeitwerk Lumen is almost identical to its source of inspiration, with a slight change in its balance spring adjustment system. It is certainly as original, characteristic and joyful to look at.

The movement measures 33.6 mm in diameter and comprises 415 parts. Within this small area, one can find a myriad of finishing techniques from perlage to free-hand engraving to mirror polish. Finishing contributes to the overall architecture splendidly. For example, the plates next to the remontoir bridge do not feature the usual bevels or circumferential polish to put the emphasize on the bridge itself. All in all, the caliber L043.3 – as most other Lange movements are, an example of movement architecture and finish.

Update 24.10.2021

A. Lange & Söhne expanded the Lumen collection by re-visiting the Zeitwerk Lumen on 24th October 2021. The beloved phantom of ours is offered in honey gold with the updated mechanism derived from the more user friendly Zeitwerk Date caliber.

The honey gold Zeitwerk Lumen is limited to 200 pieces. Apart from its case, the new edition shows a few differences compared to the original platinum variant. The most striking one perhaps is the famous time bridge. Instead of the prior full black on the reference 140.035, now it is in more silver colour, closer to the regular variant’s tone. In my opinion, this takes the badassery from the Phantom but still, far from being a deal breaker!

Moreover, the new Zeitwerk Lumen received the hour digit pusher upgrade from Zeitwerk Date. Prior to this upgrade, you had to pull the crown and advance the minute digits to reach the desired hour. Now, this fantastic watch is much easier to set with this quick adjuster.

Zeitwerk Date

Recommended Reading:

Zeitwerk Date

The new Lumen carries the movement from Zeitwerk Date, minus the date function of course. This means, the new caliber L043.9 comes with 72 hours of power reserve instead of the previous 36 and a new shape for the remontoire bridge. Visually, it is more symmetrical, more emphasized with finish with the additions such as sunray finish over the double barrel, and unique as usual.

Zeitwerk Lumen Honey Gold
Identical to Zeitwerk Date, the caliber L043.9. Courtesy of Lange Uhren GmbH

The price of the new Zeitwerk Lumen is $145k. This is a steep increase compared to its platinum sibling from 2010 which was offered at $91k. However, looking at the recent auction results of Lumen pieces, it is logical that Lange wanted a piece of the action too, hence its MSRP. Even though strict bundling practices left a bad taste in many collectors’ mouth, the new Zeitwerk Lumen is surely going to sell out in short notice, and prove itself at auctions or the secondary market soon enough.

The Verdict – A Masterpiece

Zeitwerk (arguably) is one of the turning points in modern watchmaking. Following the trailblazer Opus 3, it is the first mechanical watch to digitally display hours and minutes. A third (Lange 1 and Datograph being the other two) shock for the industry from a small manufacture in a town called Glashütte which is only known by hardcore watch enthusiasts. A contradiction in appearence, albeit the best watch to reflect A. Lange & Söhne’s innovative, never standing still soul. An aesthetic and technical masterpiece.

Zeitwerk Lumen or the so-called Phantom builds on this legacy and somehow manages to elevate it. It is such a marvelous thing, it is impossible to look away when on the wrist. From trying to catch the light at different angles to see the discs beneath the sapphire glass to feeling the strong impulse every minute, this platinum piece of art is a must have for any collector if affordable.

A Lange Sohne zeitwerk phantom lumen luminous platinum black dial special edition 140.035 lumed charged dial
Poetry. Courtesy of

For me, Zeitwerk Lumen is the best watch I have ever seen.

Buying a Zeitwerk Lumen

Seemingly, many Zeitwerk Luminous owners share the same mind-set with me and just cannot separate from their beloved Phantom. Indeed, the Lumen version, neither the rarest nor the most known, has appeared in auctions only two times since its introduction in 2010. You have a better chance of scoring a 30 piece limited Handwerkskunst (which is not less of a watch) than scoring a Zeitwerk Lumen.

Reference 140.035 first appeared at Christie’s Hong Kong Auction in 2015 and sold for HKD 1 million (roughly $130k) against a retail price of $91k in 2010. The second time it was at Phillips in 2016 with the sales price of HKD 937k or roughly $120k.

Knowing the private deals between collectors and the crowd chasing this magnificent piece, I am sure that the Zeitwerk Phantom is bound to skyrocket at value in the coming years. Article written in February 2021.

Thank you.

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