Seiko 5 Sports GMT vs Seiko Prospex SPB143

Side-by-side comparison of specifications and features

Seiko5 Sports GMT

SSK001

SeikoProspex

SPB143

Key Differences

Best Value

Seiko 5 Sports GMT (SSK001)

Starting from $400

Best Water Resistance

Seiko Prospex (SPB143)

200m (2x more)

Biggest Price Drop

Seiko Prospex (SPB143)

-3.7% in 30 days

Price Comparison

Seiko 5 Sports GMT

MSRP

$400

New

$570

Used

$264

Seiko Prospex

MSRP

$1,200

New

$1,399

Used

$938

MSRP New (Amazon) Used (eBay)

Comparison of Seiko 5 Sports GMT, Seiko Prospex
Specification	Seiko 5 Sports GMT	Seiko Prospex
Pricing
MSRP	$400	$1,200
New Price	$570	$1,399
Used Price (Low)	$264	$938
Used Price (High)	$1,023	$1,890
30-Day Trend	↑ +3.2%	↓ -3.7%
Used Price Range	$264 - $1,023	$938 - $1,890
Identity
Reference	SSK001	SPB143
Nickname	N/A	N/A
Style	Sports, Tool	Diver, Tool
Release Era	2020s	2020s
Dimensions
Diameter	42.5mm	40.5mm
Thickness	N/A	13.2mm
Lug Width	N/A	20mm
Lug to Lug	N/A	47.6mm
Movement
Movement	Automatic	Automatic
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)	200m (diving)
Bezel	Bidirectional 24-hour	Unidirectional rotating
Dial
Dial Color	Black	Gray
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

If you are deciding between Seiko 5 Sports GMT and Seiko Prospex SPB143, the real decision is usually about wrist presence versus easier fit, water-ready utility versus dressier everyday wear, sports character versus diver versatility. Treat it as a value-versus-upgrade decision — confirm the extra spend solves a problem you will notice every week.

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 SPB143

Seiko Prospex SPB143 is a better fit for smaller wrists, mechanical-watch enthusiasts, diver styling.

Key Differences

Movement and upkeep

Seiko 5 Sports GMT: automatic movement

Seiko Prospex SPB143: automatic movement

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

Size and wearability

Seiko 5 Sports GMT: 42.5mm

Seiko Prospex SPB143: 40.5mm · L2L 47.6mm

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 SPB143: 200m

Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.

Price and value

Seiko 5 Sports GMT: $400

Seiko Prospex SPB143: $975

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 SPB143: diver

Seiko 5 Sports GMT leans more sports, while Seiko Prospex SPB143 pulls toward diver 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 SPB143: 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 are specifically shopping for a sports style watch.
You want the lower current entry price.

Choose Seiko Prospex SPB143 If...

You want a smaller case footprint on the wrist.
Swimming, beach use, or tougher daily wear is part of the plan.
You are specifically shopping for a diver style watch.

Price and Value Notes

Seiko 5 Sports GMT is often the value play at current pricing, while Seiko Prospex SPB143 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

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $975 · Live listings

Affiliate links — WatchCompared earns a commission on qualifying purchases. This doesn't affect your price.

Comparison FAQ

Which one is better for smaller wrists?

Seiko Prospex SPB143 — it is 40.5mm wide versus 42.5mm.

Which is better for swimming or rough daily wear?

Seiko Prospex SPB143 — it is rated 200m versus 100m. Both are in the same broad bracket, so treat this as a tiebreaker rather than a deciding factor.

Is the more expensive one worth it?

Seiko 5 Sports GMT is the value pick at roughly $575 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.