Side by side

Omega Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mmvsGrand Seiko SLGA015

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

What people say

Owners + reviewers, side by side

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

Omega Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm

Owners widely report the Omega Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm offers adequate wrist presence and can handle an active lifestyle, with some finding it a wearable everyday watch. However, multiple owners suggest a 40-42mm size would be more proportional and comfortable, with one noting the bracelet feels chunky. One owner finds the 44mm Diver 300M Chronograph GMT cluttered and too busy to read quickly, while another appreciates its all-in-one complications for daily wear and travel. On balance, owners and reviewers find the Omega Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm a capable watch, though its 44mm size is a point of contention for some.

Grand Seiko SLGA015

The Grand Seiko SLGA015 is widely praised for its exceptional accuracy, with owners reporting performance far exceeding the stated 10 seconds per month. The Spring Drive movement's smooth sweep and 5-day power reserve are also noted strengths, as is the lighter titanium case construction. However, some owners find the bracelet extension non-intuitive, and one noted the clasp scratched easily. The watch features a nature-inspired, wave-like dial texture. Overall, owners rate the Grand Seiko SLGA015 highly for its impressive accuracy and quality construction.

At a glance

17 of 29 specs differ
Diameter
Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm44mm
SLGA01543.8mm
Power Reserve
Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm60h
SLGA015120h
Water Resistance
Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm300m
SLGA015200m
MSRP
Seamaster Diver 300M Co Axial Master Chronometer Chronograph 44mm$27,300
SLGA015$12,600

Full specifications

Case

7 specs
Diameter
44mm
43.8mm
Thickness
17.2mm
13.8mm
Lug-to-Lug
52.8mm
51.5mm
Lug Width
21mm
23mm
Material
18kt Sedna Gold
Titanium
Finish
Steel
Water Resistance
300m
200m

Crystal & Dial

3 specs
Crystal Shape
Domed
AR Coating
Yes
Dial Color
Black

Movement

6 specs
Caliber
Omega 9900
9RA5
Type
Automatic
Spring Drive
Power Reserve
60h
120h
Hacking
Yes
No
Hand-winding
Yes
No
Complications
Chronograph
None

Pricing

1 specs
MSRP
$27,300
$12,600
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