The Lanco Alarm: Appreciating Langendorf’s Innovative and Overlooked Single-Crowned Mechanical Alarm

It’s no secret that the visuals of a watch are often why collectors pull the trigger on adding yet another piece to their collection. It could be a specific color, the inclusion of a certain desirable bezel insert, the symmetry of a double register chronograph, or many other aesthetic reasons. This isn’t to say that the movement and build quality are not also a part of this decision-making process, but one of the chief reasons many of us love to collect is for the joy we feel putting one on wrist, potentially matching it with an outfit, and gawking at it throughout our busy days. What I wish to do here is move away from this mindset and instead appreciate how mechanical ingenuity can produce the same amount of excitement and allure. This Lanco Alarm watch may seem relatively lackluster at first glance. A simplistic silver case and dial with very few flashy or notable design choices, it could be easily mistaken for dozens of watches and brands who sold timepieces in the 1960s and 70s. Its most interesting characteristic is perhaps what’s most unremarkable on any other vintage dress piece: the use of a single crown. 

By the 1960s, brands like Vulcain, Jaeger-LeCoultre, Poljot, Girard-Perregaux, Citizen, Bulova, and Helbros had released their own alarm watches, many of which utilized movements made by outside movement manufactures like A. Schild and Venus. The common denominator between these models and movements was the two crown layout: one typically adjusted and wound the spring for the movement, while the other set the alarm and wound its own separate spring. The Lanco throws this rationale out the window and rebuilds the mechanical alarm movement from the ground up, all packed within a perfectly proportioned case. 

The Langedorf Line of Single Crown Mechanical Alarm Movements

Langendorf may be a name many collectors have heard in passing but know very little about. To offer a quick summary, Uhrenfabrik Langedorf SA was established in 1873 by Colonel Johann Viktor Kottmann to immediate success. By the 1950s, the company was rebranded to “Lanco” and purchased by the Société Suisse pour l’Industrie Horlogère (SSIH) Group in 1965. While the company would later dissolve by the 1980s, our watch-in-question’s life begins here in the early stages of Lanco’s involvement with SSIH. 

Langendorf produced a number of mechanical alarm movements throughout their impressive history. The cal. 1241, 1243, and 1244 movements were all built of a similar construction but had minor differences in configuration and design. My watch contains an iteration of the Gruen cal. 910SS, a rebadged cal. 1243 for the U.S. market denoted by the addition of a sounding spring around the movement and a micro-adjuster atop the balance cock. Benrus, another U.S. company, utilized these movements under their Ristalarm series, though little information exists on those models outside the material gathered about these Langendorf movements themselves. It seems that these innovative movements were used in a number of different watches and brands but still never received much attention in the years following their creation.

Before I go any further, I must first recognize Richard Askham and John King for their invaluable research and knowledge on these Langendorf movements. Richard’s The Watch Spot Blog is a digital library of useful information on a variety of watches he has worked on throughout his 15+ year career as an independent watchmaker. His piece on the Lanco-fon Alarm was essential in formulating this article, and it was because of John’s watch that Richard had the opportunity to work on and research these interesting movements. If you are interested in learning more about the movement and Langendorf’s history, I highly recommend reading Richard’s article after reading through this one.

Mechanical Functionality and Design

Now let’s talk about the star of the show: the mechanical alarm. How does it work? With the crown fully seated, a clockwise turn winds the alarm’s mainspring and a counterclockwise turn winds the watch’s mainspring. The user engages or disengages the operating lever when switching between the two winding methods. This, in turn, either activates or deactivates the alarm’s functionality altogether (seen by the white, for off, or red, for on, dot located in the 12 o’clock index). The movement’s alarm can be set by pulling the crown into the first position and rotating counterclockwise, while the watch’s timekeeping can be set by pulling the crown into the second position and winding clockwise. I posted a video of the alarm activating on my Instagram for those interested in hearing what it sounds like. Richard’s article goes into far more depth than this brief snapshot, so if you’re interested in the intricacies of the movement mechanically, please refer to his article.

Moving to this specific model’s overall design, it’s clear that Lanco wanted it to be understated. The dial has a light sunburst effect which, in conjunction with the raised, polished indices, helps to add just a touch of flair to the simplistic construction of the model altogether. I had initially thought the lume was a tritium-based material because of its coloring and overall condition, but with a lack of “T” markings near the “Swiss Made” text at the bottom of the dial, I cannot confirm nor deny my initial assumption––especially not knowing when the exact date of production is. Dimensions wise, this model measures in at a perfect 35mm across, 42mm lug-to-lug, and a slightly chunkier 12mm thick because of the intricate movement. Many of the other Lanco models utilizing this movement family are on the 33mm and smaller side of dimensions, so when I finally got this one in hand, I was happy to see it was a smidgeon larger. 

Taking the case back off reveals some additional interesting details and features. Packed inside is a shield to protect the wealth of gears and parts required to make this unique movement tick. Carved out is a small hole where the micro-adjuster sits on the balance cock, allowing the user to easily regulate the movement without risking a hairspring-destroying screwdriver slip. It’s an interesting touch and one I wish was present on more vintage mechanical watches. With the case back and shield removed, it’s a joy to watch this movement at work. Knowing the uniqueness of its construction truly adds to the allure of what lies underneath the parts visible on the surface.

While not nearly as visually striking as most of the other watches I’ve written about in the past, what powers this Lanco is a movement that deserves far more recognition by the collecting community. In reality, the Langendorf lineup of single-crowned alarm movements can be compared to “sleeper” cars that, on the surface, look to be relatively stock but under the hood house an array of performance parts. This Lanco may look like a typical three-handed dress piece with no frills or thrills from a distance, but get up close and personal with it, and its charm quickly becomes apparent. 

The next time you think about adding a Vulcain Cricket or Jaeger-LeCoultre Memovox to your collection, I hope you keep in mind the Langendorf single-crown movements and the impressive ingenuity they represent. They may not have the widely publicized history of the Vulcain and JLC alarm watches, but what they do possess is a criminally overlooked reimagining of what a mechanical alarm watch can be.