Seiko 5 Sports GMT vs Seiko Prospex Speedtimer

Side-by-side comparison of specifications and features

Seiko5 Sports GMT

SSK001

SeikoProspex Speedtimer

SSC813

Key Differences

Best Value

Seiko 5 Sports GMT (SSK001)

Starting from $400

Price Comparison

Seiko 5 Sports GMT

MSRP

$400

New

$570

Used

$264

Seiko Prospex Speedtimer

MSRP

$725

New

$805

Used

$1,029

MSRP New (Amazon) Used (eBay)

Comparison of Seiko 5 Sports GMT, Seiko Prospex Speedtimer
Specification	Seiko 5 Sports GMT	Seiko Prospex Speedtimer
Pricing
MSRP	$400	$725
New Price	$570	$805
Used Price (Low)	$264	$1,029
Used Price (High)	$1,023	$1,607
30-Day Trend	↑ +3.2%	↑ +105.6%
Used Price Range	$264 - $1,023	$1,029 - $1,607
Identity
Reference	SSK001	SSC813
Nickname	N/A	N/A
Style	Sports, Tool	Chronograph, Sports
Release Era	2020s	2020s
Dimensions
Diameter	42.5mm	39mm
Thickness	N/A	13.7mm
Lug Width	N/A	20mm
Lug to Lug	N/A	N/A
Movement
Movement	Automatic	Solar Powered
Power Reserve / Battery	N/A	N/A
Accuracy	N/A	N/A
Case
Case Material	Stainless Steel	Stainless Steel
Crystal	Hardlex	Sapphire Crystal
Water Resistance	100m (recreational diving)	100m (recreational diving)
Bezel	Bidirectional 24-hour	Tachymeter
Dial
Dial Color	Black	White
Luminous	Yes	Yes
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

Seiko 5 Sports GMT and Seiko Prospex Speedtimer can overlap on price or use case, but the buying decision usually comes down to mechanical feel versus low-maintenance convenience, wrist presence versus easier fit, sports character versus chronograph versatility. They both touch the sports 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.

Seiko 5 Sports GMT

Seiko 5 Sports GMT is a better fit for buyers who want more wrist presence, mechanical-watch enthusiasts, sports styling.

Seiko Prospex Speedtimer

Seiko Prospex Speedtimer is a better fit for smaller wrists, low-maintenance daily wear, chronograph styling.

Key Differences

Movement and upkeep

Seiko 5 Sports GMT: automatic movement

Seiko Prospex Speedtimer: solar movement

Seiko 5 Sports GMT uses a automatic movement, while Seiko Prospex Speedtimer uses a solar movement — that changes day-to-day ownership, upkeep, and the overall feel on the wrist.

Size and wearability

Seiko 5 Sports GMT: 42.5mm

Seiko Prospex Speedtimer: 39mm

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

Seiko 5 Sports GMT: 100m

Seiko Prospex Speedtimer: 100m

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

Price and value

Seiko 5 Sports GMT: $400

Seiko Prospex Speedtimer: $725

There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.

Style and use case

Seiko 5 Sports GMT: sports

Seiko Prospex Speedtimer: chronograph

Seiko 5 Sports GMT leans more sports, while Seiko Prospex Speedtimer pulls toward chronograph use case — pick the one that matches how you will actually wear it.

Crystal and materials

Seiko 5 Sports GMT: Hardlex crystal · steel

Seiko Prospex Speedtimer: sapphire crystal · steel

Crystal choice can change long-term wear expectations — one may prioritize scratch resistance while the other keeps cost or vintage feel in check.

Choose Seiko 5 Sports GMT If...

You prefer more dial presence and a larger case feel.
You prefer a mechanical watch experience and do not mind more upkeep.
You are specifically shopping for a sports style watch.

Choose Seiko Prospex Speedtimer If...

You want a smaller case footprint on the wrist.
You want a lower-maintenance daily watch.
You are specifically shopping for a chronograph style watch.

Price and Value Notes

Seiko 5 Sports GMT is often the value play at current pricing, while Seiko Prospex Speedtimer makes more sense if you will use its extra features regularly.

There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.

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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Seiko 5 Sports GMT

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $387 · Live listings

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Seiko Prospex Speedtimer

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $1297 · Live listings

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Comparison FAQ

Which movement is easier to live with day to day?

Quartz and solar models are usually easier for grab-and-go use, while automatic and manual watches appeal more to buyers who enjoy the mechanical side of watch ownership.

Which one is better for smaller wrists?

Seiko Prospex Speedtimer — it is 39mm wide versus 42.5mm.

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?

Seiko 5 Sports GMT is the value pick at roughly $325 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.