Side by side

Fortis Marinemaster M-44 DLCvsTudor Black Bay One 31

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

Marinemaster M-44 DLC
FortisMarinemaster M-44 DLC
MSRP $5,450
Black Bay One 31
TudorBlack Bay One 31
MSRP $4,600

At a glance

13 of 29 specs differ
Diameter
Marinemaster M-44 DLC44mm
Black Bay One 3131mm
Power Reserve
Marinemaster M-44 DLC38h
Black Bay One 3150h
Water Resistance
Marinemaster M-44 DLC300m
Black Bay One 31100m
MSRP
Marinemaster M-44 DLC$5,450
Black Bay One 31$4,600

Full specifications

Case

8 specs
Diameter
44mm
31mm
Thickness
14mm
9.5mm
Lug-to-Lug
46mm
Lug Width
22mm
17mm
Material
Stainless Steel (DLC)
Stainless Steel
Finish
Brushed and polished
Polished + Satin
Water Resistance
300m
100m
Caseback
Solid
Solid screw-down

Crystal & Dial

1 specs
Dial Color
Black
Anthracite

Movement

3 specs
Caliber
Sellita SW220-1
MT5201
Power Reserve
38h
50h
Jewels
26
25

Pricing

1 specs
MSRP
$5,450
$4,600

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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.

Tudor Black Bay One 31

Owners widely report the Tudor Black Bay One 31's polished case and bracelet scratch easily, though its wearability under gloves and robust movement are praised. Some desire more micro-adjustment options on the clasp, and a lack of contrast between the silver dial and hands is noted. The 31mm size may be a consideration for daily wear due to its 50-hour power reserve. On balance, owners and reviewers appreciate the Tudor Black Bay One 31 for its comfortable wearability and robust movement, despite concerns about case scratching and clasp adjustability.

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