The Casio F-91W: The Watch That Belongs to Everyone

There is a tendency among watch collectors to equate significance with expense. We talk about hand-finished movements, precious metals, limited production and provenance. Entire businesses exist to determine whether one nearly identical stainless-steel sports watch deserves to be worth $8,000 while another deserves to be worth $80,000. I participate in this world willingly. I love mechanical watches, unusual movements and obscure references as much as anyone.

But sitting at almost the exact opposite end of the watch industry is the Casio F-91W, a little black digital watch that makes a compelling argument that importance and price have almost nothing to do with one another.

Casio introduced the F-91W in 1989. More remarkably, the company still sells it today. The basic design has survived essentially unchanged: a rectangular black resin case, resin strap, LCD display and three pushers controlling a stopwatch, alarm, calendar and light. The current watch measures 38.2 by 35.2 millimeters, is just 8.5 millimeters thick and weighs only 21 grams. A single CR2016 battery is rated by Casio to last approximately seven years, while the quartz module is specified to an accuracy of plus or minus 30 seconds per month.

None of this sounds particularly remarkable today. That may be the most remarkable thing about it.

The F-91W is an example of what happens when an industrial product becomes so thoroughly suited to its purpose that redesigning it becomes almost unnecessary. Casio says the watch was engineered around affordability from the beginning. The module uses a reduced number of components, while even seemingly insignificant details were reconsidered to lower manufacturing costs. Instead of conventional spring bars, for example, Casio used simpler pins to attach the strap to the case. The goal wasn't to make a cheap imitation of an expensive watch. It was to design a genuinely good inexpensive watch.

That distinction matters.

The watch industry is full of products whose desirability depends partly on scarcity. Casio took the opposite approach. The F-91W became successful precisely because there was nothing exclusive about it. It was inexpensive, reliable, understandable and available almost everywhere.

Exactly how many have been produced is difficult to establish. A figure of roughly three million watches per year has circulated for years and is frequently repeated as fact, but Casio has never publicly confirmed F-91W production totals. Even if the estimate is considerably off, the number produced over nearly four decades is enormous.

The F-91W didn't become important because it was scarce. It became important because it was everywhere.

A Watch Without a Social Class

One of the more famous F-91W owners was Barack Obama, who was photographed wearing the watch before becoming president. That last part is important. This wasn't a presidential attempt at appearing relatable. It was simply a watch he owned and wore.

There is something revealing about seeing an F-91W on the wrist of someone who would later become one of the most recognizable people in the world. Most watches change meaning depending on who wears them. Put a complicated Patek Philippe on a billionaire and nobody is particularly surprised. Put a cheap Casio on someone who could afford virtually anything and suddenly people want to know why.

The F-91W resists that kind of interpretation because it has never belonged exclusively to any particular group. It can be worn by a schoolkid, a mechanic, a soldier, a banker or a watch collector and look perfectly reasonable on all of them. There is no membership requirement and very little status attached to owning one. It may be one of the closest things the watch world has to a universal object.

That universality, however, also led the F-91W into a considerably darker chapter of its history.

When an Ordinary Watch Became Evidence

Following the September 11 attacks and the war in Afghanistan, the F-91W began appearing in a very different context. Documents associated with detainees at Guantánamo Bay showed that U.S. military analysts regarded possession of certain Casio digital watches, particularly the F-91W and the metal-bracelet A159W, as a possible indicator of explosives training.

The reasoning was not entirely invented. Cheap digital Casio watches had been used as components in improvised explosive devices, and U.S. military material alleged that students attending al-Qaeda bomb-making courses in Afghanistan were issued Casio watches and taught to use them in timing devices.

According to a U.S. military briefing that later became public, approximately one-third of Guantánamo detainees captured with the specified Casio models had some documented connection to explosives, explosives training or people associated with explosives. More than 50 detainee assessments reportedly mentioned the watches, including dozens of references specifically to the black F-91W.

It is an extraordinary footnote in the history of a consumer product. Ownership of one of the most common watches in the world had become one item among the factors being evaluated by military intelligence.

It is also important not to sensationalize what those documents mean. Wearing an F-91W obviously did not make someone a terrorist, nor was possession of the watch by itself proof of terrorist activity. The very qualities that made the watch useful in ordinary life also made it attractive in environments where inexpensive, dependable timing devices were needed.

The F-91W was ubiquitous because it was cheap and reliable. Those characteristics don't change depending on the intentions of the person wearing it.

That is what makes this part of the watch's history so strange. The F-91W had become so universally available that it could simultaneously be an ordinary school watch in one country and appear in an American intelligence assessment in another.

There are very few watches whose history ranges that widely.

The Triumph of Good Enough

The F-91W has been described as a triumph of adequacy, which may sound like faint praise but is actually an excellent description of its achievement. The watch does not attempt to impress anyone. It simply performs a small number of functions dependably and inexpensively.

Its stopwatch measures to 1/100th of a second. There is a daily alarm and hourly signal. It displays the day and date, switches between 12- and 24-hour time, and includes an LED light. Casio calls it water resistant, although the standard F-91W isn't marketed with the sort of depth rating associated with a dive watch.

Even its shortcomings have become part of its personality. Nobody buys an F-91W because its illumination is spectacular or because resin glass offers the scratch resistance of sapphire. You buy one because the entire object weighs less than an ounce, runs for years on a battery, keeps remarkably good time and costs little enough that wearing it doesn't require a second thought.

In an era when practically everything we carry is trying to become smarter, there is also something increasingly appealing about how little the F-91W wants from its owner. It doesn't require charging every night. It doesn't measure blood oxygen, count steps or display text messages. It doesn't need a Bluetooth connection, an operating-system update or a subscription. It doesn't know where you are.

It simply tells you what time it is.

For a wristwatch, that remains a surprisingly useful feature.

What 1989 Got Right

The longevity of the F-91W is perhaps its greatest achievement. Consumer electronics from 1989 are museum pieces today. Personal computers, televisions, mobile phones and music players from that period have been rendered obsolete several times over. Even many digital watches from the era now look unmistakably vintage.

The F-91W simply kept going.

Its basic design has been carried forward from the watch's 1989 introduction. More than three decades of changing fashion have somehow failed to make the little rectangular case irrelevant. If anything, the passage of time has made it more recognizable.

As someone who designs watches, I find that fascinating.

Designers are constantly tempted to add something. Another texture, another function, another line on the dial, another feature that gives the marketing department something to talk about. The F-91W is a reminder that sometimes the harder decision is knowing when there is nothing left to add.

Its design isn't timeless because Casio predicted what people would want decades later. It is timeless because almost everything about it exists for a reason.

The Most Democratic Watch in the World

Collectors will probably never discuss the F-91W with the reverence reserved for a Paul Newman Daytona or a Patek Philippe perpetual calendar. Nor should they. Those watches represent completely different achievements.

But I think the Casio represents an achievement that may be even harder to replicate.

It escaped the watch industry.

The F-91W became something people buy without necessarily being "watch people." It has crossed borders, generations, income levels and cultures. It has been worn because someone needed an inexpensive watch, because someone liked the design, because someone appreciated the irony, and probably most often because someone simply needed to know the time.

Its history includes a future American president and, bizarrely, American intelligence assessments concerning terrorism. It has been treated as disposable, fashionable, suspicious and iconic, sometimes simultaneously. Yet through all of that cultural baggage, the actual object barely changed.

That is what interests me about the F-91W.

We spend a lot of time in the watch world discussing what makes something collectible. Rarity certainly helps. Craftsmanship matters. Provenance can transform an otherwise ordinary watch into an artifact. Branding can add thousands of dollars to the value of two objects performing essentially the same function.

The F-91W doesn't really need any of those things.

Its significance comes from the opposite direction. Instead of becoming important because very few people could own one, it became important because almost anyone could.

There is something beautifully democratic about that.

Nearly four decades after its introduction, Casio is still making it. People are still buying it. And in an industry perpetually searching for the next icon, one of the greatest examples has been sitting in plain sight since 1989.

It's black, plastic, weighs 21 grams and runs for about seven years on a battery.

Sometimes good design really is that simple.

Davis Raine
Founder, Wayward Watch Company
Find Your Way.