Casio A158 vs Casio F-91W

Side-by-side comparison of specifications and features

CasioA158

A158W

CasioClassic

F-91W-1

Key Differences

Best Value

Casio F-91W (F-91W-1)

Starting from $27

Biggest Price Drop

Casio F-91W (F-91W-1)

-4.9% in 30 days

Price Comparison

Casio A158

MSRP

$30

New

$38

Used

$20

Casio Classic

MSRP

$23

New

$27

Used

$15

MSRP New (Amazon) Used (eBay)

Comparison of Casio A158, Casio Classic
Specification	Casio A158	Casio Classic
Pricing
MSRP	$30	$23
New Price	$38	$27
Used Price (Low)	$20	$15
Used Price (High)	$146	$35
30-Day Trend	↑ +3.5%	↓ -4.9%
Used Price Range	$20 - $146	$15 - $35
Identity
Reference	A158W	F-91W-1
Nickname	N/A	N/A
Style	Digital, Casual, Vintage	Digital, Casual
Release Era	1980s	1980s
Dimensions
Diameter	33mm	33.2mm
Thickness	N/A	8.5mm
Lug Width	N/A	18mm
Lug to Lug	N/A	38mm
Movement
Movement	Quartz	Quartz
Power Reserve / Battery	N/A	N/A
Accuracy	N/A	N/A
Case
Case Material	Resin	Resin
Crystal	Acrylic	Acrylic
Water Resistance	30m (splash resistant)	30m (splash resistant)
Bezel	Fixed	Fixed
Dial
Dial Color	Silver/Black	LCD
Luminous	No	No
Community
Review Rating	N/A	N/A
In Collections	N/A	N/A
On Wishlists	N/A	N/A
Forum Threads	N/A	N/A

Quick Summary

Casio A158 and Casio F-91W can look close on a spec sheet, yet the tradeoffs that matter most are usually wrist presence versus easier fit. They both touch the digital and casual use case, so smaller spec differences can matter more than brand preference.

How to choose

The biggest practical difference is usually movement and upkeep. Start with wrist fit and movement preference, then use water resistance and price to break the tie.

Casio A158

Casio A158 is a better fit for low-maintenance daily wear, digital styling.

Casio F-91W

Casio F-91W is a better fit for low-maintenance daily wear, digital styling.

Key Differences

Movement and upkeep

Casio A158: quartz movement

Casio F-91W: quartz movement

Both use the same movement type, so maintenance differences are limited and fit or feature details should decide the purchase.

Size and wearability

Casio A158: 33mm

Casio F-91W: 33.2mm · L2L 38mm · 21g

Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features.

Water resistance

Casio A158: 30m

Casio F-91W: 30m

Water resistance is similar on paper, so focus on fit, features, and price instead.

Price and value

Casio A158: $30

Casio F-91W: $27

These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price.

Style and use case

Casio A158: digital

Casio F-91W: digital

Both lean into a similar digital use case — the choice is more about fit, features, and price than category.

Crystal and materials

Casio A158: acrylic crystal · resin

Casio F-91W: acrylic crystal · resin

Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.

Why These Watches Are Often Compared

Casio A158 and Casio F-91W get compared constantly because both are digital/casual watches, they are within 0.2mm of each other in case width, they share the same quartz movement — so the spec sheet alone will not tell you which to buy.

The Differences You Will Notice in Daily Use

Casio A158 is around $30 and Casio F-91W around $27 — about a $3 gap at typical listings.
Worth knowing before you buy: Casio F-91W weighs about 21g, so most owners stop noticing it on the wrist.

Which One Should You Buy

Casio F-91W for most buyers — Casio A158 is around $30 and Casio F-91W around $27 — about a $3 gap at typical listings.

Sources: https://theslenderwrist.com/casio-f91w-vs-a158w/

Choose Casio A158 If...

You like that Casio A158 reads as a shinier retro/vintage accessory rather than a plain utility digital.

Choose Casio F-91W If...

You want the lower price — Casio F-91W typically runs about $3 less.

Price and Value Notes

Casio F-91W usually offers the lower entry price — confirm current listings because marketplace pricing can move quickly.

These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price.

Where to Check Deals

Check current deals on Amazon and eBay using the buttons below — listing prices, seller quality, and condition can change quickly.

Check current deals on Amazon and eBay

Prices change often, so compare the latest listings and condition options before you buy.

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Casio A158

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $40 · Live listings

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Casio F-91W

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $19 · Live listings

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Comparison FAQ

Which one is better for smaller wrists?

Neither is clearly smaller: case width is 33mm vs 33.2mm. Pick on strap and looks instead — the size difference is not what will decide this for you.

Which is better for swimming or rough daily wear?

They are rated the same, so water resistance will not decide this. Choose on strap material and how much you mind scratching the case.

Is the more expensive one worth it?

Casio F-91W is the value pick at roughly $3 less. Pay more only if a specific difference above matters to you — otherwise the cheaper one is the smarter buy. Confirm live listings, since marketplace pricing moves.

What is the actual difference between Casio A158 and Casio F-91W?

Casio A158 is around $30 and Casio F-91W around $27 — about a $3 gap at typical listings. That is the difference you will notice day to day; the rest of the specs are close enough not to matter.

Which one should I buy?

Casio F-91W for most buyers — Casio A158 is around $30 and Casio F-91W around $27 — about a $3 gap at typical listings.