Seiko Prospex vs Seiko Prospex Speedtimer

Side-by-side comparison of specifications and features

SeikoProspex

SPB155 (Baby Alpinist)

SeikoProspex Speedtimer

SSC813

Key Differences

Best Value

Seiko Prospex (Ref. SPB155 (Baby Alpinist))

Starting from $500

Best Water Resistance

Seiko Prospex (Ref. SPB155 (Baby Alpinist))

200m (2x more)

Biggest Price Drop

Seiko Prospex Speedtimer (SSC813)

-6.6% in 30 days

Price Comparison

Seiko Prospex

MSRP

$725

New

$500

Used

$334

Seiko Prospex Speedtimer

MSRP

$725

New

$783

Used

$485

MSRP New (Amazon) Used (eBay)

Comparison of Seiko Prospex, Seiko Prospex Speedtimer
Specification	Seiko Prospex	Seiko Prospex Speedtimer
Pricing
MSRP	$725	$725
New Price	$500	$783
Used Price (Low)	$334	$485
Used Price (High)	$2,500	$1,297
30-Day Trend	↓ -2.5%	↓ -6.6%
Used Price Range	$334 - $2,500	$485 - $1,297
Identity
Reference	SPB155 (Baby Alpinist)	SSC813
Nickname	N/A	N/A
Style	Field, Sports, Tool	Chronograph, Sports
Release Era	2010s	2020s
Dimensions
Diameter	38mm	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	Sapphire Crystal	Sapphire Crystal
Water Resistance	200m (diving)	100m (recreational diving)
Bezel	Fixed	Tachymeter
Dial
Dial Color	Green	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

This Seiko Prospex vs Seiko Prospex Speedtimer comparison is less about a universal winner and more about mechanical feel versus low-maintenance convenience, water-ready utility versus dressier everyday wear, field 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 Prospex

Seiko Prospex is a better fit for mechanical-watch enthusiasts, field styling.

Seiko Prospex Speedtimer

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

Key Differences

Movement and upkeep

Seiko Prospex: automatic movement

Seiko Prospex Speedtimer: solar movement

Seiko Prospex 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 Prospex: 38mm

Seiko Prospex Speedtimer: 39mm

Their size profiles are relatively close, so fit comes down to shape, weight, and how each watch sits on your wrist.

Water resistance

Seiko Prospex: 200m

Seiko Prospex Speedtimer: 100m

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

Price and value

Seiko Prospex: $500

Seiko Prospex Speedtimer: $603

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

Seiko Prospex: field

Seiko Prospex Speedtimer: chronograph

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

Crystal and materials

Seiko Prospex: sapphire crystal · steel

Seiko Prospex Speedtimer: sapphire crystal · steel

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

Choose Seiko Prospex If...

You prefer a mechanical watch experience and do not mind more upkeep.
Swimming, beach use, or tougher daily wear is part of the plan.
You are specifically shopping for a field style watch.

Choose Seiko Prospex Speedtimer If...

You want a lower-maintenance daily watch.
You are specifically shopping for a chronograph style watch.

Price and Value Notes

Seiko Prospex 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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Seiko Prospex

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $580 · Live listings

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Seiko Prospex Speedtimer

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $603 · Live listings

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

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?

Start with case width and lug-to-lug. The watch that looks smaller on paper is often the safer choice, but lug shape and thickness still affect how it wears.

Which is better for swimming or rough daily wear?

Use the water resistance row as the first filter. Higher ratings generally give more flexibility for swimming and water exposure, but strap choice and overall condition still matter.

Should I choose based on price alone?

Price matters, but the better buy is the watch that matches your fit, feature priorities, and use case. Check live listings first, then decide whether the price gap actually changes the ownership experience.