Glycine Airman (1953 Original, 24-Hour Dial, Purist)

The Glycine Airman holds a special place in the history of aviation watches. Introduced in 1953 at the suggestion of an actual airline pilot, it was the first wristwatch to feature a true 24-hour dial where the hour hand completed one full revolution every 24 hours rather than 12. For collectors of vintage pilot watches, the original 1953 Glycine Airman in its "Purist" configuration (meaning the pure, unmodified original version) is a grail piece that represents the birth of a category.

The Birth of the Airman

The Glycine Airman story begins with a letter. In the summer of 1953, Samuel Glur, the sales manager for Glycine Watch Company, was traveling through Southeast Asia on a business trip. During a flight from Bangkok to Calcutta aboard a Thai Airways DC-4, Glur was invited into the cockpit and seated next to Captain Ched Brown, a pilot who had strong opinions about what a proper aviation watch should be.

Captain Brown told Glur that no existing watch truly met the needs of professional pilots. He sketched out a wish list: the watch should be waterproof, automatic, have a calendar function, and most critically, it should feature a 24-hour dial. Since more and more international aviation was being conducted on Greenwich Mean Time (GMT), a 24-hour watch would allow pilots to track both local time and GMT simultaneously, using the dial for one and the rotating external bezel for the other.

Glur took detailed notes and brought the concept back to Charles Hertig, the owner of Glycine, at their headquarters in Bienne, Switzerland. The two men immediately began working on prototypes. They selected the Felsa 694 movement as the base caliber, modified it to drive a 24-hour display, and designed a case with an external rotating bezel marked in 24-hour increments. They named the watch "Airman," since the idea had come from an actual airman.

After successful testing, Glycine filed for patent CH 314050 on December 2, 1953, and shipped the first batch of Airman watches before Christmas that year. Captain Brown and his colleagues were the first customers.

What Makes the 1953 Original Special

The original 1953 Glycine Airman is distinguished from later production by several key features:

True 24-hour dial. This is the defining characteristic. The hour hand rotates once every 24 hours, not 12. The dial is marked from 1 to 24 (or in some variants, with even numbers only). At noon, the hour hand points straight down. At midnight, it points straight up. This takes getting used to for anyone accustomed to 12-hour watches, but for pilots operating on GMT, it becomes second nature.

Rotating 24-hour bezel. The external bezel is bidirectional and marked in 24-hour increments. By setting the bezel, a pilot can track a second time zone at a glance. This was years before Rolex introduced the GMT-Master (1955) and a full decade before most other manufacturers offered dual-time watches.

Automatic movement. The Felsa 694 base caliber was modified by Glycine to drive the 24-hour display. It features 21 jewels and a rotor winding system. The movement was robust and reliable, qualities essential for a tool watch intended for professional use.

Hacking mechanism. By 1955, Glycine added a unique hacking (seconds-stopping) mechanism to the Airman. Rather than using a conventional lever to halt the balance wheel, Glycine devised a system where a pin popped up onto the dial surface when the crown was pulled out. This allowed pilots to synchronize their watches to a time signal with precision. No other watch company has used this particular hacking mechanism, making it a uniquely Glycine feature.

Luminous dial. The hands and hour markers were treated with radium-based luminous paint (later replaced with tritium), essential for reading the watch in the dark cockpit conditions that pilots frequently encountered.

The "Purist" Designation

In Glycine Airman collecting circles, "Purist" refers to the original watch configuration: the full 24-hour dial with no 12-hour subdial, no GMT hand, and no concessions to conventional timekeeping. The hour hand simply goes around once in 24 hours, period. Later Glycine Airman models added a conventional 12-hour hand alongside the 24-hour display, or used a GMT hand pointing to a 24-hour scale. These are wonderful watches in their own right, but the Purist version, with its uncompromising commitment to the 24-hour concept, is the one collectors prize most highly.

The Purist configuration forces you to think about time differently. You cannot glance at it and instinctively read the time the way you would a conventional watch. You have to engage with it, and that deliberate engagement is part of its charm. It is a watch designed for professionals who measured time in a specific way, and it asks you to meet it on its own terms.

Military Connections

The Glycine Airman quickly found favor beyond commercial aviation. Military units around the world adopted the Airman as an unofficial (and in some cases, official) duty watch. U.S. Air Force pilots, Army Special Forces, and personnel from numerous other military branches wore Airman watches in service.

During the Vietnam War era, the Airman became particularly popular among American helicopter pilots and special operations soldiers. Its 24-hour display was invaluable for coordinating operations across time zones, and its robust construction held up to the harsh conditions of jungle warfare. Glycine was flexible about customization, producing batches with unit insignia on the dial or custom bezel markings for specific military customers.

These military connections add both historical significance and collector value to original Airman watches. Examples with documented military provenance command significant premiums.

Condition and Value Guide

Original 1953 through early 1960s Glycine Airman watches are genuinely rare. Production numbers were modest (batches ranged from 25 to 1,000 pieces depending on the customer), and many were used hard in professional aviation and military service. Here is what the market looks like:

Condition	Description	Price Range
Excellent (All Original)	Original dial, hands, crown, case, running well	$8,000 to $15,000
Very Good (All Original)	Light dial aging, original hands and case, minor wear	$5,000 to $8,000
Good (Mostly Original)	Dial patina, possible replaced crown, original case and movement	$3,000 to $5,000
Fair (Service Dial/Hands)	Replacement dial or hands, original case and movement	$1,500 to $3,000
Project/Parts	Not running, missing parts, significant case damage	$500 to $1,500

Later Airman models from the 1960s and 1970s are more common and trade in the $1,500 to $5,000 range depending on condition and configuration. Modern reissues from the current Glycine lineup (now owned by the Invicta Group) are available new for $500 to $1,500 but are not comparable to the vintage originals in terms of collector value.

Authentication Tips

The vintage Airman market has its share of franken-watches (assembled from parts of different watches) and misrepresented pieces. Here is what to look for:

Case back. Genuine Airman cases carry the patent number CH 314050 on the case back. The case should be stainless steel with a screw-down back.

Dial. Original dials are the most frequently replaced component. Look for consistent aging, correct font and printing, and proper luminous marker style for the era. The dial should be signed "Glycine" with "Airman" beneath.

Movement. The base caliber should be appropriate for the production date. Early examples use the Felsa 694; later models used various A. Schild and ETA calibers. The movement should show signs of quality finishing and proper Glycine modifications.

Crown. Original Glycine crowns are signed and should be the correct size and style for the reference.

The Glycine Airman in Context

The Glycine Airman deserves recognition alongside the Rolex GMT-Master, the Breitling Navitimer, and the Omega Speedmaster as one of the foundational tool watches of the 20th century. While it never achieved the same mainstream fame as those models, the Airman was actually first to market with the concept of a dual-time pilot watch. Rolex's iconic GMT-Master, developed for Pan Am pilots, did not arrive until 1955, two full years after the Airman.

The difference in recognition comes down to marketing and distribution. Glycine was a small Swiss manufacturer based in Bienne, while Rolex was (and is) one of the most powerful brands in the world. But among serious watch collectors and aviation enthusiasts, the Glycine Airman's pioneering status is well understood and deeply respected.

For the collector who values historical significance, ingenious engineering, and the romance of mid-century aviation, the original 1953 Glycine Airman Purist is a watch that tells a story every time you strap it on. It is a conversation starter, a history lesson, and a beautifully functional timepiece all in one.

Evolution of the Airman Line

Following the success of the original 1953 model, Glycine continued to develop the Airman throughout the decades. In March 1955, the company introduced the hacking mechanism described above, along with an add-on date magnifier that anticipated the cyclops lens later popularized by Rolex. The mid-1950s also saw improvements to the case design for better water resistance and refinements to the dial layout for improved legibility.

By the 1960s, Glycine was offering the Airman in multiple configurations. The Airman SST featured a larger case and updated movement. The Airman Special introduced variations in dial color and bezel design. Throughout these iterations, the core concept remained the same: a true 24-hour pilot watch designed for professional use.

The 1970s brought the quartz crisis, which devastated the Swiss watch industry. Glycine survived, but production of mechanical Airman models slowed considerably. The company pivoted to quartz movements for a period before returning to mechanical production as the vintage watch revival gained momentum in the 1990s and 2000s.

Today, Glycine (acquired by the Invicta Group in 2016) continues to produce Airman models, including heritage-inspired reissues that pay tribute to the 1953 original. While these modern watches are excellent values in their own right, they serve primarily as entry points into the Airman universe. The serious collector will always gravitate toward the vintage originals, where the history, the craftsmanship, and the scarcity combine to create something truly special.

Why the Original Matters

In a market increasingly dominated by mega-brands and multi-thousand-dollar waiting lists, the vintage Glycine Airman represents a different kind of collecting philosophy. It is a watch that was designed to solve a real problem for real professionals. It was not created as a status symbol or a fashion accessory. It was built because a pilot told a watchmaker what he needed, and the watchmaker listened.

That story, the conversation between Samuel Glur and Captain Ched Brown in the cockpit of a DC-4 over Southeast Asia, is part of what makes the original Airman so compelling. Every time you look at the 24-hour dial, you are looking at the direct result of that conversation. The watch exists because someone who actually flew airplanes told someone who actually made watches what would make his job easier. That kind of authenticity is rare in any product category, and it is what elevates the 1953 Glycine Airman from a mere collectible to a genuine piece of aviation and horological history.

Buying Strategies

For collectors entering the vintage Airman market, patience is key. These watches appear at auction, on vintage watch forums like Watchuseek and Omega Forums, and through specialized dealers. The best examples tend to sell quickly when priced fairly, so having your research done in advance and being ready to act is important.

Expect to pay a premium for documented provenance, especially military connections. A Vietnam-era Airman with a verifiable service history from a specific unit or individual will command significantly more than an equivalent watch without that documentation.

Consider joining the Glycine collecting community online. Dedicated collectors are generous with their knowledge and can help authenticate potential purchases, identify correct parts, and connect you with reputable sellers. The collector community surrounding the Airman is smaller and more intimate than those around Rolex or Omega, which can be an advantage when you are learning the nuances of the reference.

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