Inquire Cart (0)
Home  /  Shop  /  Watches  /  Seiko Mod Deep Sea – Automatic Diver Watch
Blue Seiko Deep Sea mod automatic dive watch with black bezel and stainless steel bracelet
The back view of a stainless steel wrist watch with a metal link bracelet, showing the brushed and polished surfaces, crown, and engraved case details on a light gray background.
A Seiko Prospero Sea-Dweller wristwatch with a stainless steel bracelet, featuring a black dial with bright green luminescent markers and a black bezel with a blue 60-minute subdial.
A wrist wearing a Seiko stainless steel dive watch with a black dial and black rotating bezel, photographed against a gray stone surface with a small plant in the background.
A Bexford wristwatch with a blue dial and silver stainless steel case, displayed inside an open black Bexford presentation box on a dark background.
Blue Seiko Deep Sea mod automatic dive watch with black bezel and stainless steel bracelet
The back view of a stainless steel wrist watch with a metal link bracelet, showing the brushed and polished surfaces, crown, and engraved case details on a light gray background.
A Seiko Prospero Sea-Dweller wristwatch with a stainless steel bracelet, featuring a black dial with bright green luminescent markers and a black bezel with a blue 60-minute subdial.
A wrist wearing a Seiko stainless steel dive watch with a black dial and black rotating bezel, photographed against a gray stone surface with a small plant in the background.
A Bexford wristwatch with a blue dial and silver stainless steel case, displayed inside an open black Bexford presentation box on a dark background.
Blue Seiko Deep Sea mod automatic dive watch with black bezel and stainless steel bracelet
Bexford Watches  ·  Watches

Seiko Mod Deep Sea – Automatic Diver Watch

Price

$388.00

In Stock  ·  Ships within 3–5 business days

Just 1 left. Order soon!

1-Year Warranty
Quick Ship
14-Day Returns
Hand Assembled

Built for those who want the unmistakable presence of a serious dive watch with a custom edge.

This custom-built automatic diver features a striking blue sunburst dial, paired with a ceramic rotating dive bezel, luminous details, and substantial stainless steel construction that gives it a bold presence on the wrist.

Powered by the proven NH35A automatic movement, it delivers dependable mechanical performance without the need for a battery. Sapphire crystal provides excellent scratch resistance, while BGW9 lume enhances visibility in low-light conditions.

With its rugged dive-inspired construction and classic Oyster-style bracelet, this build balances serious capability with a refined look that works just as well every day.

 

Highlights

  • Reliable mechanical performance
  • Rich color that shifts beautifully with the light
  • Excellent scratch resistance and clarity
  • 120-click action with BGW9 lume
  • Built for serious water-ready performance
  • Solid, durable construction
  • Classic sport-watch design

This watch is an independently assembled custom MOD timepiece built around an NH35A automatic movement and selected components. It is not a factory-produced Seiko model and is not manufactured, authorized, endorsed, or warranted by Seiko Watch Corporation.

Bezel 120 Clicks unidirectional rotation
Bezel insert 40mm ceramic with BGW9 lume
Bracelet style Oyster
Case back Screwdown
Case diameter 43.5 mm
Case material 316L Stainless Steel
Crown Screwdown crown
Glass Sapphire crystal
Lug to lug 52 mm
Lug width 21 mm
Movement NH35A
Power reserve 41H+
Thickness 15 mm
Water resistance 50Bar (500M)
Weight 238 g

Every Bexford watch is hand-assembled at our bench. We source the same components we use in our own daily wearers. All finished watches ship with a 1-year assembly warranty — if something isn't right, we make it right.

Shipping: In-stock items ship within 3–5 business days. Made-to-order items ship within 14 days.

Returns: 14-day returns for unworn, unmodified items. Made-to-order builds are final sale unless defective.

The Catalog

You may also like

View All Models →
In Stock A Seiko Oyster Perpetual Datejust watch with a silver stainless steel fluted bezel and link bracelet, featuring a dark green dial with silver-tone indices and hands.

Watches

Seiko Datejust Mod

$388.00

Automatic • 100m Water Resistant
In Stock Seiko Bruce Wayne GMT automatic mod watch with black and gray bezel and jubilee bracelet

Watches

Seiko Bruce Wayne Mod

$488.00

GMT • Automatic • Ceramic Bezel
In Stock A Seiko Diver's Automatic watch with a stainless steel link bracelet, featuring a vibrant blue dial, a black rotating bezel, and silver-tone indices.

Mods

Seiko Prospex Mod

$388.00

Automatic • 200m Diver
In Stock Seiko SPB207 green automatic mod watch with stainless steel bracelet

Watches

Seiko SPB207 Mod

$788.00

Original Parts • Automatic • Sapphire Crystal
FAQ

Common Questions.

Still have questions? Reach out directly.

We primarily use Seiko NH35, NH36, and NH34 automatic movements — proven, serviceable, and reliable. Movement caliber is always listed in the product specs.
Our average build time is 14 days. Sold-out items typically have a ~1-month lead time — we'll confirm before you pay.
Yes. All finished Bexford watches include a 1-year warranty covering assembly defects and movement issues.
Yes. Diver models use screw-down crowns and casebacks and are pressure-tested before shipping. The Sentinel is rated to 100m / 330ft.
Absolutely. We sell the exact same movements, dials, and components we use in our own builds. Browse the Movements, Dials, and Stickers categories in the shop.
Sold-out items remain visible with an "Inquire to Order" option. Use the contact form — we'll give you a firm lead time and hold your spot.