Which is cheaper, the Fortis Marinemaster M-44 DLC or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

At MSRP the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition is the cheaper of the two at $1,350, against $5,450 for the Fortis Marinemaster M-44 DLC — a $4,100 gap before any retailer discounting.

Which is bigger, the Fortis Marinemaster M-44 DLC or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Fortis Marinemaster M-44 DLC wears larger at 44mm versus 42.7mm for the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition — a 1.3mm difference across the dial.

Which has better water resistance, the Fortis Marinemaster M-44 DLC or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Fortis Marinemaster M-44 DLC is rated to 300m versus 200m for the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition.

Which has a longer power reserve, the Fortis Marinemaster M-44 DLC or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition carries a 70-hour power reserve against 38 hours on the Fortis Marinemaster M-44 DLC.

What movement does the Fortis Marinemaster M-44 DLC run compared to the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

Both watches run automatic movements — the Fortis Marinemaster M-44 DLC uses the Sellita SW220-1 and the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition uses the 6R35.

Side by side

Fortis Marinemaster M-44 DLCvsSeiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

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

Fortis Marinemaster M-44 DLC

M-44 DLC

MSRP $5,450

Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

spb301j1

MSRP $1,350

At a glance

13 of 29 specs differ

Diameter

Marinemaster M-44 DLC44mm

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition42.7mm

Power Reserve

Marinemaster M-44 DLC38h

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition70h

Water Resistance

Marinemaster M-44 DLC300m

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition200m

MSRP

Marinemaster M-44 DLC$5,450

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition$1,350

Full specifications

Case

6 specs

Diameter

44mm

42.7mm

Thickness

14mm

13.2mm

Lug-to-Lug

—

46.4mm

Lug Width

22mm

20mm

Material

Stainless Steel (DLC)

Stainless Steel

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Sellita SW220-1

6R35

Power Reserve

38h

70h

Jewels

Pricing

1 specs

MSRP

$5,450

$1,350

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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-44 DLC

The Fortis Marinemaster M-44 DLC is widely praised for its robust COSC-certified Kenissi Werk 11 movement, offering a 70-hour power reserve, and its stealthy, scratch-resistant Dianoir DLC coating. Owners find it comfortable to wear despite its 44mm size, with one owner considering it a standout piece. Some reviewers note a subtle difference in the color tone of the DLC coating on the crown and bezel lock between variants. Overall, owners and reviewers regard the Fortis Marinemaster M-44 DLC highly for its durable construction and reliable, high-spec movement.

Fratello

Monochrome

Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition is praised for its beautiful design and refinement over previous models, featuring vertically textured glacier-inspired dials. Owners, however, consider the €1500 RRP too high, suggesting a price closer to €900-€1000, noting the aluminum bezel insert instead of ceramic. Some owners report the 6R movement runs slow. On balance, owners find the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition beautiful and a refinement, but the price and aluminum bezel are points of contention.

Hodinkee

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