Which is cheaper, the Fortis Marinemaster M-40 or the Grand Seiko SBGX355?

At MSRP the Fortis Marinemaster M-40 is the cheaper of the two at $3,520, against $4,100 for the Grand Seiko SBGX355 — a $580 gap before any retailer discounting.

Which is bigger, the Fortis Marinemaster M-40 or the Grand Seiko SBGX355?

The Fortis Marinemaster M-40 wears larger at 40mm versus 37mm for the Grand Seiko SBGX355 — a 3mm difference across the dial.

Which has better water resistance, the Fortis Marinemaster M-40 or the Grand Seiko SBGX355?

The Fortis Marinemaster M-40 is rated to 300m versus 100m for the Grand Seiko SBGX355.

Which has a longer power reserve, the Fortis Marinemaster M-40 or the Grand Seiko SBGX355?

The Grand Seiko SBGX355 carries a 40-hour power reserve against 38 hours on the Fortis Marinemaster M-40.

What movement does the Fortis Marinemaster M-40 run compared to the Grand Seiko SBGX355?

The Fortis Marinemaster M-40 runs a automatic caliber (Sellita SW220-1), while the Grand Seiko SBGX355 runs a quartz (9F62).

Side by side

Fortis Marinemaster M-40vsGrand Seiko SBGX355

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

Fortis Marinemaster M-40

M-40

MSRP $3,520

Grand Seiko SBGX355

sbgx355g

MSRP $4,100

At a glance

14 of 29 specs differ

Diameter

Marinemaster M-4040mm

SBGX35537mm

Power Reserve

Marinemaster M-4038h

SBGX35540h

Water Resistance

Marinemaster M-40300m

SBGX355100m

MSRP

Marinemaster M-40$3,520

SBGX355$4,100

Full specifications

Case

7 specs

Crystal & Dial

2 specs

AR Coating

Inner

Yes

Dial Color

Orange

Black

Movement

4 specs

Caliber

Sellita SW220-1

9F62

Type

Automatic

Quartz

Power Reserve

38h

40h

Jewels

Pricing

1 specs

MSRP

$3,520

$4,100

Follow this matchup

Get a note when Fortis Marinemaster M-40 vs Grand Seiko SBGX355 gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Fortis Marinemaster M-40

Owners praise the Fortis Amber Orange for its gorgeous appearance and strong wrist presence, noting its crazy lume and 70-hour power reserve. The Doxa SUB 300T, described as having a superb, eccentric design with a highly legible dial and functional no-decompression bezel, uses an ETA 2824-2 movement. However, the SUB 300T's 42.5mm case wears large and its 14mm thickness is not ideal for dress shirts, though it boasts 1,200m water resistance. On balance, owners appreciate the Fortis Amber Orange for its striking aesthetics and impressive lume.

WatchUSeek·2

Grand Seiko SBGX355

The Grand Seiko SBGX355 is widely praised for its beautiful dial, excellent finishing, and perfect 37mm size. Owners report unparalleled accuracy from the 9F62 quartz movement, rated to within 10 seconds per year. The high-intensity titanium case and 100m water resistance are noted features. Some consider the SBGX355 a "baby Snowflake" and a more accessible alternative to other models. Overall, owners and reviewers rate the Grand Seiko SBGX355 highly for its iconic Snowflake dial and exceptional quartz accuracy in a wearable 37mm case.

From video reviewers

The titanium case finishing is a significant strength. The deployant clasp is noted as prone to rattle. Reviewers disagree on the ideal case size for everyday wear.

Keep exploring