Thorn · Factory brand · China

Thorn Sub 300T

In production · Diver

Design reference: Doxa SUB 300T

Thorn Sub 300T with yellow dial in the steel case on a yellow rubber strap
Photo: Thorn
  • Thorn Sub 300T with turquoise dial in the steel case on a turquoise rubber strap
  • Thorn Sub 300T with orange dial in the steel case on an orange rubber strap
  • Thorn Sub 300T with yellow dial in the black case on a yellow rubber strap
  • Thorn Sub 300T with turquoise dial in the black case on a turquoise rubber strap
  • Thorn Sub 300T with dark dial in the black case on a black rubber strap
From $142
  • Seiko NH35A
  • 44 mm × 12.5 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
44 mm
Lug to lug
48 mm
Thickness
12.5 mm
Lug width
20 mm
Material
Steel
Hardening
—
Water resistance
200 m
Crown
Screw-down
Case back
—
Bezel
Unidirectional, 120 clicks, steel insert

Crystal & dial

Crystal
Sapphire
Shape
Domed
Anti-reflective
Yes (side not stated)
Lume
Japan C3 (green)

Bracelet

Bracelet
—

Weight

Head only
—
On bracelet
—
On strap
—

Prices

VariantConfigurationTypePriceUSDAs ofSource
All—Street141.51 USD$1422026-10-24link

Variants

NameDialConfiguration
Yellowyellow—
Turquoiseturquoise—
Orangeorange—
Yellow, Black Caseyellowblack case ("PVC black steel")
Turquoise, Black Caseturquoiseblack case ("PVC black steel")
Blackdark blue-blackblack case ("PVC black steel")

About this entry

80% of key specs known. Missing: weight, hardening, bracelet offered.

Doxa SUB 300T-style diver with a cushion case and a steel bezel insert. The listing gives no model code (the SKUs read 300T only), so the store's name is used. Brand specs: Japan NH35 automatic ("41 hours"), "surgical grade" stainless steel case (grade not stated), 120-click unidirectional bezel with a stainless steel insert, domed ("bubble") sapphire with AR coating (side not stated), Japan C3 green lume, screw-down crown and caseback, 200m, "case dimension" 44mm (recorded as the diameter), 12.5mm "height" (whether that includes the crystal is not stated), 48mm lug-to-lug, 20mm lugs. The black-case versions are listed as "PVC Black steel"; the coating is not described further. The photos show a date window at 3 and wavy-pattern rubber straps (not described). Option names are the store's, with "Turqoise" corrected; the "Black" option photographs with a dark blue-black dial. Price 41.51 (crossed-out 59) for every version; Yellow in the black case and Orange were sold out on 2026-10-25. First listed on Thorn's store in April 2023.

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

Sources