Side by side

Bremont ionBirdvsSeestern Sub 300 V4

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

ionBird
BremontionBird
MSRP $5,800
Sub 300 V4
SeesternSub 300 V4
MSRP $10

At a glance

18 of 29 specs differ
Diameter
ionBird43mm
Sub 300 V442mm
Power Reserve
ionBird40h
Sub 300 V441h
Water Resistance
ionBird
Sub 300 V4200m
MSRP
ionBird$5,800
Sub 300 V4$10

Full specifications

Case

9 specs
Category
Pilot
Diver
Diameter
43mm
42mm
Thickness
13mm
Lug-to-Lug
46mm
Lug Width
20mm
Material
Titanium
316L Stainless Steel
Finish
Brushed and polished
Brushed + Sandblasted
Water Resistance
200m
Caseback
Solid
Solid screw-down

Crystal & Dial

3 specs
AR Coating
Inner
Underside
Dial Color
Regular length (15cm - 19cm wrist size)
Orange
Lume
None
Japan Lume (blue glow)

Movement

5 specs
Caliber
Seiko NH35A
Beat Rate
28,800 vph
21,600 vph
Power Reserve
40h
41h
Jewels
25
24
Complications
None
GMT, Date

Pricing

1 specs
MSRP
$5,800
$10

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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.

Bremont ionBird

Owners report the Bremont ionBird is overpriced and features a printed dial with a poorly placed date window at 4:30, which some find visually disruptive. However, some owners suggest its case finishing is superior to competitors. The 43mm titanium Bremont ionBird GMT is powered by a COSC-certified BE-93-2AV automatic movement and retails for $5,795. On balance, owners and reviewers find the Bremont ionBird's date window placement and price point to be significant drawbacks.

Seestern Sub 300 V4

Owners widely praise the Seestern Sub 300 V4 for its terrific fit and finish and surprising little touches at its $179 price, noting top-notch case, dial, bezel, and crystal. The bracelet is considered nice enough for the price point, and the watch is powered by the solid and reliable Seiko NH35 movement. Some owners report that the polished sides of the case show signs of wear. Overall, owners rate the Seestern Sub 300 V4 highly for its excellent case, dial, and bezel finishing at the price.

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