Side by side

Bremont ionBirdvsRZE Fortitude GMT

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

ionBird
BremontionBird
MSRP $5,800
Fortitude GMT
RZEFortitude GMT
MSRP $719

At a glance

13 of 29 specs differ
Diameter
ionBird43mm
Fortitude GMT41mm
Power Reserve
ionBird40h
Fortitude GMT40h
Water Resistance
ionBird
Fortitude GMT200m
MSRP
ionBird$5,800
Fortitude GMT$719

Full specifications

Case

7 specs
Category
Pilot
GMT
Diameter
43mm
41mm
Thickness
12mm
Lug-to-Lug
47mm
Lug Width
20mm
Material
Titanium
Grade 5 Titanium
Water Resistance
200m

Crystal & Dial

3 specs
AR Coating
Inner
Underside
Dial Color
Regular length (15cm - 19cm wrist size)
Red
Lume
None
Super-LumiNova BGW9

Movement

2 specs
Caliber
Miyota 9075
Complications
None
GMT

Pricing

1 specs
MSRP
$5,800
$719

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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.

RZE Fortitude GMT

The RZE Fortitude GMT is widely praised for its lightweight titanium construction and durable UltraHex coating, offering exceptional value under $700. Owners and reviewers highlight its comfortable wearability, with a bracelet featuring a quick-adjust clasp and multiple micro-adjustment positions. The Miyota 9075 flyer GMT movement is noted for its accuracy, with one owner reporting -1 to +1 seconds per day, though another source states a range of -10/+30 seconds per day. The watch's design is appreciated for its soul and attention to detail, including a subtle red crown tube indicator and faceted lugs, and its Nimbus Grey dial features a coarse, sandpaper-like texture and fumé effect. A reviewer points out the rotor can be loud and a smaller screwdriver is needed for sizing, while an owner found the GMT hand lume confusing. Overall, owners and reviewers rate the RZE Fortitude GMT highly for its comfortable titanium build, durable coating, and excellent value.

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