Side by side

Biatec T. G. MasarykvsSeestern S450 Ocean Star

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Add a watch
T. G. Masaryk
BiatecT. G. Masaryk
MSRP $2,214
S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299
Buy from Biatec ↗
Buy used on eBay ↗
Buy from Seestern ↗
Buy used on eBay ↗

At a glance

9 of 29 specs differ
Diameter
T. G. Masaryk40mm
S450 Ocean Star40mm
Power Reserve
T. G. Masaryk41h
S450 Ocean Star41h
Water Resistance
T. G. Masaryk100m
S450 Ocean Star100m
MSRP
T. G. Masaryk$2,214
S450 Ocean Star$299

Full specifications

Case

2 specs
Category
—
Diver
Thickness
11.15mm
12mm

Crystal & Dial

2 specs
Dial Color
Beige
White
Lume
None
Tritium

Movement

4 specs
Caliber
Sellita SW200-1
TMI NH35A
Beat Rate
28,800 vph
21,600 vph
Jewels
25
24
Complications
None
GMT, Date

Pricing

1 specs
MSRP
—
$299
Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Feynman Timekeepers Coalesce
Feynman Timekeepersmicro

Coalesce

6 variantsRef. the-panda
39mm·Automatic
$5,448MSRP
—Used
Traska Freediver Arctic
Traskamicro

Freediver Arctic

Ref. FRD-WHT-NDT-V7
40mm·Automatic·200m WR
$735MSRP
—Used
Maen Manhattan 37 IFL Edition
Maenmicro

Manhattan 37 IFL Edition

8 watches · 30 variantsManhattan
37mm·Automatic·100m WR
$1,199MSRP
—Used
Christopher Ward C60 Atoll 300
Christopher Wardmicro
Atoll

C60 Atoll 300

2 watches · 3 variantsAtoll
40mm·Automatic·300m WR
$1,320MSRP
—Used
Beaufort Permian Rift
Beaufortmicro

Permian Rift

4 variantsRef. permian-rift-azurite
38mm·Automatic
—MSRP
—Used
Phoibos Argo
Phoibosmicro

Argo

Ref. phoibos-argo-200m-automatic-diver-watch-py052f-spiral-sunray-yellow
40.5mm·Automatic·200m WR
$345MSRP
—Used
Lucky Harvey Chiming Horse
Lucky Harveymicro

Chiming Horse

3 variantsRef. chiming-automaton-horse-watch-in-grade-5-titanium-alloy-blue-2026-collector-s-edition
39mm·Automatic
$2,399MSRP
—Used
Phoibos Storm Corsair
Phoibosmicro

Storm Corsair

4 variantsStorm Corsair
40mm·Automatic·200m WR
$480MSRP
—Used
All alternatives to the T. G. Masaryk →All alternatives to the S450 Ocean Star →
Explore the full catalog

Follow this matchup

Get a note when Biatec T. G. Masaryk vs Seestern S450 Ocean Star gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Feynman Timekeepers CoalescevsSeestern S450 Ocean StarMaen Manhattan 37 IFL EditionvsSeestern S450 Ocean StarBeaufort Permian RiftvsSeestern S450 Ocean StarLucky Harvey Chiming HorsevsSeestern S450 Ocean StarBiatec T. G. MasarykvsTraska Freediver ArcticBiatec T. G. MasarykvsChristopher Ward C60 Atoll 300
Edit this comparisonAdd another watchExplore more 39–41mm watches