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Casio F-91W-1YEG
Casio F-91W-1YEG.
Casio F-91W-1YEG.

Casio F-91W-1YEG

Price 29.99 USD excluding sales tax
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It's the usual story: they were supposed to come up with a cheap and small wristwatch but ended up creating a hit and a culture icon that has lasted for decades. The F-91W was Ryusuke Moriai's first design for Casio. Wonder if he got praise? Everyone should own at least one of these.

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Casio F-91W-1YEG.
Casio F-91W-1YEG.

It's the usual story: they were supposed to come up with a cheap and small wristwatch but ended up creating a hit and a culture icon that has lasted for decades. The F-91W was Ryusuke Moriai's first design for Casio. Wonder if he got praise? Everyone should own at least one of these.

The F-91W is famous and doesn't pick sides: it's distinctly the only brand-accessory ever photographed on Osama Bin Laden but has also been worn by a certain Barack Obama.

It's also well-known that this exact module has seen a lot of use as a timer in nefarious devices; it's cheap, instructions for modding are easy to find, and these are sold by the millions every single year. Any item this popular is next to impossible to trace, and seeing a random person wearing one doesn't really help profiling at all. The F-91W just floats everywhere like some kind of a Casio spirit, and its steadily beating quartz heart is only concerned with keeping time.

You would think a model this old would be obsolete, and when it comes to features, that is correct. However, very few watches are so astonishingly lightweight and small, yet accurate and reliable. Other watches may have armor and cushioning but the F-91W has another strategy: it's too small to hit with anything and it doesn't snag and bump thanks to the low profile.

The suffix 1YEG means the color code (1 for Black), and the letters denote production series and sales region. The various regions are most often just packaged a bit differently, and the manual language varies.

Technical Specs

Casio wristwatches have so much in common that finding the right one for you may be difficult. Here are some simple facts:

  • Width: 35.2 mm
  • Height: 38.2 mm
  • Thickness: 8.5 mm
  • Weight: 21 g
  • Battery / Life: CR2016 / 7 years
  • Water Resistance: "Water Resistant"
  • Made in China
  • Module: 593


You only get the very basic features with this model, all other watches have at least these (usually better):


Stopwatch with 1/100th precision to 60 minutes only (most others measure up to 24 hours at least). Displays elapsed time and can be toggled for split times and 1st and 2nd places.

The split time in Casio watches means freezing the elapsed time on the screen while the stopwatch keeps running in the background. E.G. if you run 1:36 laps with a steady pace, your first split time will be 1:36, the second one 3:12, then 4:48, and so on.

Alarm Clock / Hourly Signals

You can set hourly time signals on or off, and one daily alarm.

Somewhat automatic calendar

Most modern watches have a fully automatic calendar for decades to come. This one is smart enough to know that February has 28 days. As all months do, when you think about it, but February has just 28 days. Except on leap years.

Check the date sometime.


The not-so-good old green LED lights up the left side of the display. Higher-end models of today have something they call the Super Illuminati. You can make do with this one, just guess the minutes unless you have the eyesight of an owl.

Made by Casio

The first invention by Tadao Kashio was the yubiwa pipe: a ring that allows you to smoke a cigarette hands-free and all the way to the end. Tobacco was expensive in war-torn Japan (because WWII), and people had their hands full of work, so this was exactly what the market wanted. With the profits from the pipe, Kashio could fund the development of Casio's first electro-mechanical calculator.

High intelligence and flair for business combined with this sort of diligence could not have led to anything but the success Casio has achieved. The company has been the first mover too many times to mention. Let's skip the list this time.

Being the first mover has not sacrificed quality: many people still use Casio wristwatches they bought 40 years ago, and they have gained the trust of NASA, numerous special (and non-special) forces, law enforcement, paramedics, and so on. Another long list. The TL;DR is that all of these are damn good, pick any one you like!

All products: Casio


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Five stars
I would recommend for a friend

Tämän jälkeen ei toista kelloa tarvitse, koska tämä toimii ihan missä tahansa. Taustavalokin lähes taktinen, ei paljasta sijaintia eikä ihan herkästi kellonaikaakaan. Klassikko ja keskustelunavaus tilaisuudessa kuin tilaisuudessa.
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Four and a half stars
I would recommend for a friend

Paras kello mitä on ikinä valmistettu. Puoli pistettä pois liian lyhyestä ja helposti hajoavasta rannekkeesta, mutta onneksi asian saa korjattua helposti vaihtamalla sen vaikkapa kestävään nylon -rannekkeeseen!
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