Seestern · Factory brand · China

Seestern SUB300T

Ref. S406 · In production · Diver

Design reference: Doxa SUB 300T

Seestern SUB300T DOX01 with orange dial on beads-of-rice bracelet
Photo: Seestern
  • Seestern SUB300T DOX03 with yellow dial on beads-of-rice bracelet
  • Seestern SUB300T DOX05 with light blue dial on beads-of-rice bracelet
  • Seestern SUB300T DOX06 with white dial and checkered minute track on beads-of-rice bracelet
  • Seestern SUB300T DOX07 with black dial on beads-of-rice bracelet
  • Seestern SUB300T DOX08 with silver dial on beads-of-rice bracelet
  • Seestern SUB300T DOX09 with dark blue dial on beads-of-rice bracelet
  • Seestern SUB300T DOX10 with blue aventurine dial on beads-of-rice bracelet
  • Seestern SUB300T DOX01 with lume shots of the dial and date wheel
  • Seestern SUB300T case profile
From $190
  • Seiko NH35A
  • 42 mm × 13 mm
  • Sapphire crystal
  • 200 m water resistance

Movement

Type
Automatic
Tier
Entry
Complications
Date
Frequency
21,600 bph
Power reserve
41 h
Hacking
Yes
Accuracy (factory)
-20 / +40 s/day

Case

Diameter
42 mm
Lug to lug
46 mm
Thickness
13 mm
Lug width
20 mm
Material
Steel (316L)
Hardening
—
Water resistance
200 m
Crown
Screw-down
Case back
—
Bezel
—
Finishing
Brushed, polished and sandblasted

Crystal & dial

Crystal
Sapphire
Shape
Flat
Anti-reflective
Inner
Lume
Lume on hands, indices and date wheel (type not stated)

Bracelet & clasp

Style
Beads of rice
Links per row
—
Solid end links
—
Solid links
—
Link attachment
—
Taper
20 → 18 mm
Quick release
—
Half links
—
Clasp
—
Micro-adjust
—
Diver extension
—

Weight

Head only
—
On bracelet
—
On strap
—

Prices

VariantConfigurationTypePriceUSDAs ofSource
Orange—Street189.99 USD$1902026-10-24link
Yellow—Street189.99 USD$1902026-10-24link
Light Blue—Street189.99 USD$1902026-10-24link
White—Street189.99 USD$1902026-10-24link
Black—Street189.99 USD$1902026-10-24link
Silver—Street189.99 USD$1902026-10-24link
Dark Blue—Street189.99 USD$1902026-10-24link
Blue Aventurine—Street189.99 USD$1902026-10-24link

Variants

NameReferenceDialConfiguration
OrangeDOX01 V4orangeBeads-of-rice bracelet
YellowDOX03 V4yellowBeads-of-rice bracelet
Light BlueDOX05 V4light blueBeads-of-rice bracelet
WhiteDOX06 V4white with black-and-white checkered minute trackBeads-of-rice bracelet
BlackDOX07 V4blackBeads-of-rice bracelet
SilverDOX08 V4silverBeads-of-rice bracelet
Dark BlueDOX09 V4dark blueBeads-of-rice bracelet
Blue AventurineDOX10 V4blue aventurineBeads-of-rice bracelet

About this entry

68% of key specs known. Missing: weight, hardening, bracelet links, end links, link attachment, clasp micro-adjust.

Seestern's "Series: SUB300T", sold on Sugess's store as one listing per dial colour titled DOX01 V4, DOX03 V4 and so on; the spec tables still say "DOX01 V3", and the store SKUs (406) and image names (S406-DOX01) give the base code S406. The tritium-tube S406-2 is a separate listing. Brand specs: 316L case with brushed, polished and sandblasted finishing, 42mm without crown, 46mm lug-to-lug, 13mm thick, 20mm lugs, flat sapphire with five layers of inner AR, signed screw-down crown, 200m, lumed date wheel, NH35A, beads-of-rice steel bracelet tapering 20 to 18mm with a milled clasp offering 4 micro-adjust positions (how they adjust is not stated). The store's product-type line says 40mm; the spec table's 42mm is used (the S406-2, with identical case specs, is listed at 42mm in both places). Weight, lume grade and bezel details are not stated; the photos show a Doxa-style steel bezel with a no-decompression scale. The store's "compare at" prices are not recorded.

Last verified: 2026-10-25. Edit or correct this entry.

Sources