I love CASIO watches more than any other watches.
The F-91W is called the world’s strongest watch for simple reasons:
is simple: light, thin, easy to read, hard to break, and inexpensive.
Since its launch in 1989, it has remained beloved worldwide without changing its basic shape.
Recently, F-91W colors beyond classic black—accents, gold, and translucent bands—have multiplied, making collecting dangerously tempting.
Because it is affordable and easy to use, buying several is a perfectly reasonable strength of the F-91W.
Assuming the watches can currently be purchased online, this article introduces color variants by model number and explains how to choose before buying.
Representative F-91W Model Numbers to Know Before Choosing
• F-91W-1: classic black, the place to start if unsure
• F-91W-3: green accents, with black and green adding a connoisseur's touch
• F-91WG: gold accents that also look good in photos
• F-91WM / WB / WC / WS: derivative series that explore color, discussed below
The basic size is shared.
Its greatest appeal is a light, thin, unobtrusive size.
Color naming rules are shared with G-SHOCK.
The digits indicate colors, generally as follows.
- 1: Black
- 2: Blue
- 3: Green
- 4: Red
- 5: Brown
- 6: Purple
- 7: White
- 8: Gray
- 9: Yellow
3 Classic Directions
1) F-91W-1: Classic Black
The classic black case, black band, and blue line. The watch you ultimately come back to.
A dependable first choice.
Buying Tips
• Prices can vary considerably
• Compare across Amazon, Rakuten, and Yahoo!
• Counterfeits have been reported before, so checking the seller offers reassurance
Where to Buy the Casio F-91W-1
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Where to Buy a Screen Protector for Casio F-91W
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2) F-91W-3: Green Accents
Green accents on a black base.
The familiar F-91W with a very different feel—ideal as a 2nd watch.
Who It Suits
- Black alone feels too ordinary
- Your clothes lean toward black, khaki, or outdoor styles
- You want a twist on the classic
Where to Buy the Casio F-91W-3
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3) F-91WG: Gold Accents
Black and gold: inexpensive, yet surprisingly cool and premium-looking.
Even if gold sounds flashy, it rarely looks excessive on the F-91W.
The subtly gold LCD is a nice detail too.
Where to Buy the Casio F-91WG-9Q
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Now the Fun Begins: Colorful Derivative Series Beyond Classic Black
F-91WM: Metallic Looks
WM models explore a metallic appearance and different textures.
For people tired of the usual F-91W who still do not want to leave the F-91W behind.
It is resin rather than metal, of course, but its appearance suggests a different texture!
Buying Recommendations
- Check the case's silvery texture in photos
- Read reviews because photos and the actual watch can differ
F-91WS: Translucent Bands and Clear Styles
Lightness and transparency make it suited to summer.
An F-91W with a translucent band.
It works easily with everyday outfits without looking overly sporty.
Recommended For
- You want another watch for summer
- You wear white T-shirts and pale outfits often
- You want a breezy alternative to black
Where to Buy the Casio F-91WS-7
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Where to Buy a Screen Protector for Casio F-91W
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F-91WS-4: Pink Models
The F-91WS direction combines transparency with pastels.
The lightness of an affordable Casio pairs beautifully with these colors.
• Pale pastel pink
• Some have translucent bands with a clearer appearance
• Very popular with women
• Strong for summer
Recommended Audience
• People returning to a lighter watch from Apple Watch
• People wanting to wear it like an accessory
Where to Buy the Casio F-91WS-4
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F-91WS-2: Blue Models
• Sky-blue tones
• Subdued blues leaning toward navy
• Some examples also change the dial color
Blue is the most dependable accent color.
Lighter-looking than black
More understated than pink
More urban than green.
An excellent 2nd watch.
Where to Buy the Casio F-91WS-2
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The WC series leans even more strongly toward playful colors.
If the colors suit you, it can quickly lead to buying several.
Key Points
- The simpler your clothes, the more you can experiment with watch colors helps it stand out.
- Conversely, be careful if your clothes are also vivid, because the colors can clash
Note: WC availability fluctuates, so check which colors are currently in stock.
Where to Buy the Casio F-91WS-7A2
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Pink gold, recently popular with women, has also been added.
Translucent yet glamorous—an appealing combination.
Where to Buy the Casio F-91WS-7A3
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A translucent band enhances the lightweight impression.
• Sweat is less noticeable
• Not overly sporty
• Strong popularity among younger buyers
An easy 2nd choice for someone who already owns a black F-91W.
Minimalist, Single-Tone, Simple F-91WB Series
The WB series reduces printing and accents to a minimum, with many models expressing personality through the colors of the case, dial, and band, encouraging collecting.
Classic black for ordinary days, WB accents when you want a change. Owning these 2 works well.
F-91WB-1A: Minimalist Black in a Single Tone
Here is a slightly unusual F-91W.
No visual clutter—very simple!
For some reason, its official price is slightly higher, but it is worth buying.
Where to Buy the Casio F-91WB-1A
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F-91WB-7A: All White
White conveys a thoroughly clean appearance.
Points to Consider
White may show dirt more easily, so I recommend keeping it as a summer watch separate from your everyday model.
In my experience, however, I own an all-white affordable Casio and it does not get dirty as easily as expected.
Where to Buy the Casio F-91WB-7A
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F-91WB-8A: Standout Gold Lettering
Where to Buy the Casio F-91WB-8A
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F-91WB-2A: Standout Navy
Where to Buy the Casio F-91WB-2A1
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Vivid, Playful Overseas Models: Discontinued or Remaining Stock Only, F-91WC
The F-91WC offers vivid, playful, single-color models mainly released overseas.
However, they are difficult to find in Japan, requiring imported purchases and somewhat higher prices.
Some are discontinued, making them increasingly difficult to obtain.
Here are images for reference.
Where to Buy the Casio F-91WC
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A Summary of Colors Available Now
Main Types Relatively Readily Available Online
• Black: F-91W-1
• Green accents: F-91W-3
• Gold accents: F-91WG/WB/WC
• Metallic look: F-91WM
• Pink: F-91WC
• Blue: F-91WC / WB
• White: F-91WB
• Clear: F-91WC
• Pink-gold look: F-91WC
Because F-91W prices are low,
buying multiple colors is the best approach.
How to Choose if You Are Unsure
First Watch, a Dependable Choice: F-91W-1, Classic Black
Where to Buy the Casio F-91W-1
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Where to Buy a Screen Protector for Casio F-91W
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2nd Watch, a Change of Mood: F-91WG, Black and Gold, for a Brighter Look
Where to Buy the Casio F-91WG-9Q
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Summer: F-91WS, Translucent Band
Where to Buy the Casio F-91WS-7
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3rd Watch, for a Collection
- Choose colors and textures from F-91WM / F-91WB / F-91WC
Where to Buy the Casio F-91WB-1A
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Where to Buy the Casio F-91WB-7A
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Conclusion: Add F-91W Watches Through Color
The F-91W is already fully realized in classic black. On the other hand, it is a classic whose colors can be hard to stop collecting.
The foundation has been loved since 1989, so changing colors does not undermine its appeal.
Start with the classic F-91W-1, then try F-91W-3 or F-91WG, followed by translucent F-91WS bands or F-91WB colors.
That is the most natural path into collecting.
I hope everyone enjoys their F-91W watches!