Seiko SPB421 Prospex blue dial diver's watch on a stainless steel bracelet
Seiko SPB421 Prospex blue dial diver's watch on stainless steel bracelet set against an icy background
Close-up of Seiko SPB421 blue dial diver's watch showing the textured dial and blue bezel
Case back view of SPB421 Prospex 40.5mm stainless steel watch
Side profile of SPB421 Prospex 40.5mm stainless steel watch on bracelet
Seiko

SPB421 Prospex 40.5mm - Blue on Bracelet

$1,250
★★★★★ (1) review

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Seiko official 3 year warranty included

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Our Return Policy

Returns & Exchanges

We want you to love your watch. If it's not the right fit, our client services team is here to make returns and exchanges simple.

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How to Start a Return

Log into your account or contact our client services team at orders@teddybaldassarre.com. Returns must be started within 5 business days of receiving your order.

Return Conditions

To be eligible, your watch must be unworn, unaltered, and in its original condition with all packaging, tags, stickers, and paperwork included. Straps and bracelets must not be removed, adjusted, or sized, and the Teddy Baldassarre security tag must still be attached.

Not Eligible for Return

Special orders, watches with sized or altered bracelets, and books are final sale.

Please see our Refund Policy for full details, including restocking fees and refund timelines.
Seiko
$1,250

SPB421 Prospex 40.5mm - Blue on Bracelet

The Details

  • 40.5 mm

    Case Size

  • 13.2 mm

    Case Height

  • 47.6 mm

    Lug to Lug

  • 200m

    Water Resistance

Overview

Case Height

13.2 mm

Case Size

40.5 mm

Collection

Prospex

Style

Diver

Lug to Lug

47.6 mm

Lug Width

20 mm

Movement

Automatic

Reference

SPB421

Release Date

2023-09-01

Water Resistance

200m

Case

Bezel

Dark blue uni-directional rotating elapsed timing bezel

Caseback

Screw-down caseback

Case Material

Stainless steel with super-hard coating

Clasp / Buckle

Tri-fold push button release clasp with secure lock and extender

Crown

Screw-down

Crystal

Curved sapphire crystal with anti-reflective coating on the inner surface

Dial Color

Blue

Dial Features

Deep blue dial patterned and gradated to suggest the icy surfaces of the perilous, yet beautiful, Alaska Moulins, and a date window at 3 o'clock

Lume

LumiBrite hands and markers

Strap / Bracelet Material

Stainless steel bracelet with super-hard coating

Movement

Caliber

6R35

Function

Date

Jewels

24 Jewels

Movement

Automatic

Power Reserve

70 Hours

Vibrations Per Hour

21,600 vph

Complication

Date

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About Seiko

One Step Ahead

Seiko was founded in 1881 in Tokyo, Japan and has grown to become one of the largest watch companies in the world. Today, Seiko’s diverse collection presents impressive value backed by some of the most iconic designs in watch history. Perhaps best known for its sporty Prospex collection, Seiko’s legend also stems from the attainable Seiko 5 Sports collection as well as the refined Presage range of well-finished dress watches.

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