How much does the Seiko DressKX cost?

The Seiko DressKX has a manufacturer MSRP of $315 USD. On the secondary market it averages around —.

What movement does the Seiko DressKX use?

The Seiko DressKX is powered by the 4R36 automatic movement with a 41-hour power reserve.

How big is the Seiko DressKX?

The case measures 40mm in diameter, 11.5mm thick, with a 44.6mm lug-to-lug.

What is the water resistance of the Seiko DressKX?

The Seiko DressKX is rated to 100m of water resistance.

What kind of crystal does the Seiko DressKX have?

The Seiko DressKX uses a Hardlex crystal.

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Seiko DressKX

Name: Seiko DressKX
Brand: Seiko
SKU: srpe51
Price: 315 USD
Availability: InStock

Ref. srpe51

Sport

4 Variants

Lume:LumiBrite on hands and index(es)

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Retail MSRP

$315

Low

—

Avg

—

High

—

Static data

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Open on eBay

Case

40mm

Power Reserve

41h

Movement

Automatic

Water Resistance

100m

Crystal

Hardlex

Case Dimensions

Diameter40mm

Thickness11.5mm

Lug-to-Lug44.6mm

Lug Width20mm

Case Build

MaterialStainless Steel

Water Resistance100m

Crystal & Dial

CrystalHardlex

LumeLumiBrite on hands and index(es)

Movement

Caliber

4R36

TypeAutomatic

Beat Rate—

Power Reserve41 hours

Jewels24

HackingNo

Hand-WindingNo

ComplicationsTime only

Design Language

Dial styleMatte

BezelFixed

Bracelet / strapLug-attached bracelet

HandsBaton

AI-detected from product image · 5/22/2026

In a nutshell

The Seiko DressKX (ref. srpe51) is an automatic sport watch, with a 40mm stainless steel case, 11.5mm thick, powered by the 4R36 movement and a 41-hour power reserve. Water resistance is rated to 100m, under a hardlex crystal. Manufacturer MSRP is $315.

The Seiko 5 Sports SKX series is widely praised as a gateway mechanical watch offering exceptional value and iconic status, with owners appreciating its ruggedness, tool-like authenticity, and moddability. Many owners report the 4R36/NH36 movement achieves accuracy of +/-5 to 10 seconds per day, far exceeding its stated specifications, and the stock Jubilee bracelet is noted as surprisingly comfortable. Some owners find the Seiko 5 Sports SKX series bulky and less aesthetically pleasing than newer models, with others noting its specifications lag behind contemporary watches. The Seiko 5 Sports SKX series is considered a decent watch, especially when found under £200, but it's not the serious tool watch the original SKX was, lacking a screw-down crown, bezel pip, and ISO rating. Overall, owners rate the Seiko 5 Sports SKX series highly for its iconic dive watch lineage and excellent value at the price point.