Lorier Neptune Series IV vs Seiko SKX009

Side-by-side comparison of specifications and features

LorierNeptune Series IV

Neptune-SIV

SeikoSKX009

SKX009K1

Key Differences

Best Value

Seiko SKX009 (SKX009K1)

Starting from $350

Slimmest

Lorier Neptune Series IV (Neptune-SIV)

12.7mm thick

Price Comparison

Lorier Neptune Series IV

MSRP

$499

Used

$650

Seiko SKX009

MSRP

$350

New

$951

Used

$364

MSRP New (Amazon) Used (eBay)

Comparison of Lorier Neptune Series IV, Seiko SKX009
Specification	Lorier Neptune Series IV	Seiko SKX009
Pricing
MSRP	$499	$350
New Price	N/A	$951
Used Price (Low)	$650	$364
Used Price (High)	$650	$972
30-Day Trend	0.0%	↑ +1.1%
Used Price Range	$650 - $650	$364 - $972
Identity
Reference	Neptune-SIV	SKX009K1
Nickname	N/A	N/A
Style	Diver, Vintage	Diver, Tool
Release Era	2020s	1990s
Dimensions
Diameter	39mm	42mm
Thickness	12.7mm	13.4mm
Lug Width	20mm	22mm
Lug to Lug	46mm	46mm
Movement
Movement	Automatic	Automatic
Power Reserve / Battery	N/A	N/A
Accuracy	N/A	N/A
Case
Case Material	Stainless Steel	Stainless Steel
Crystal	Acrylic	Hardlex
Water Resistance	200m (diving)	200m (diving)
Bezel	Unidirectional rotating	Unidirectional rotating
Dial
Dial Color	Black	Blue
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

Lorier Neptune Series IV and Seiko SKX009 can look close on a spec sheet, yet the tradeoffs that matter most are usually wrist presence versus easier fit. 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.

Lorier Neptune Series IV

Lorier Neptune Series IV is a better fit for smaller wrists, mechanical-watch enthusiasts, diver styling.

Seiko SKX009

Seiko SKX009 is a better fit for buyers who want more wrist presence, mechanical-watch enthusiasts, diver styling.

Key Differences

Movement and upkeep

Lorier Neptune Series IV: automatic movement

Seiko SKX009: 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

Lorier Neptune Series IV: 39mm · L2L 46mm

Seiko SKX009: 42mm · L2L 46mm

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

Lorier Neptune Series IV: 200m

Seiko SKX009: 200m

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

Price and value

Lorier Neptune Series IV: $499

Seiko SKX009: $350

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

Lorier Neptune Series IV: diver

Seiko SKX009: diver

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

Crystal and materials

Lorier Neptune Series IV: acrylic crystal · steel

Seiko SKX009: Hardlex 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.

Why These Watches Are Often Compared

Lorier Neptune Series IV and Seiko SKX009 get compared constantly because both are diver watches, they share the same automatic movement — so the spec sheet alone will not tell you which to buy.

The Differences You Will Notice in Daily Use

Lorier Neptune Series IV has a acrylic crystal and Seiko SKX009 has a hardlex — the hardlex one resists scratches better over years of wear.
Lorier Neptune Series IV is around $499 and Seiko SKX009 around $350 — about a $149 gap at typical listings.

Which One Feels More Premium

Seiko SKX009 — Lorier Neptune Series IV has a acrylic crystal and Seiko SKX009 has a hardlex — the hardlex one resists scratches better over years of wear.

Which One Should You Buy

Seiko SKX009 for most buyers — Lorier Neptune Series IV has a acrylic crystal and Seiko SKX009 has a hardlex — the hardlex one resists scratches better over years of wear.

Choose Lorier Neptune Series IV If...

You want a smaller case footprint on the wrist.
You are comfortable paying more for a stronger feature set.

Choose Seiko SKX009 If...

You prefer more dial presence and a larger case feel.
You want the lower current entry price.

Price and Value Notes

Seiko SKX009 is often the value play at current pricing, while Lorier Neptune Series IV 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.

WatchCompared may earn a commission from qualifying purchases through affiliate links. This does not change your price.

Lorier Neptune Series IV

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $650 · Live listings

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

Seiko SKX009

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $460 · 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?

Lorier Neptune Series IV — it is 39mm wide versus 42mm. Thickness is 12.7mm vs 13.4mm, which also affects how it sits.

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 SKX009 is the value pick at roughly $149 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 Lorier Neptune Series IV and Seiko SKX009?

Lorier Neptune Series IV has a acrylic crystal and Seiko SKX009 has a hardlex — the hardlex one resists scratches better over years of wear. 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?

Seiko SKX009 for most buyers — Lorier Neptune Series IV has a acrylic crystal and Seiko SKX009 has a hardlex — the hardlex one resists scratches better over years of wear.