Side by side

Bremont ionBirdvsLongines LONGINES SPIRIT FLYBACK PROTOTYPE

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

ionBird
BremontionBird
MSRP $5,800
LONGINES SPIRIT FLYBACK PROTOTYPE
LonginesLONGINES SPIRIT FLYBACK PROTOTYPE
MSRP $7,400

At a glance

10 of 29 specs differ
Diameter
ionBird43mm
LONGINES SPIRIT FLYBACK PROTOTYPE42mm
Power Reserve
ionBird40h
LONGINES SPIRIT FLYBACK PROTOTYPE40h
Water Resistance
ionBird
LONGINES SPIRIT FLYBACK PROTOTYPE100m
MSRP
ionBird$5,800
LONGINES SPIRIT FLYBACK PROTOTYPE$7,400

Full specifications

Case

7 specs
Category
Pilot
Chronograph
Diameter
43mm
42mm
Thickness
17mm
Lug-to-Lug
49.5mm
Lug Width
22mm
Material
Titanium
Stainless Steel
Water Resistance
100m

Crystal & Dial

1 specs
Dial Color
Regular length (15cm - 19cm wrist size)
Green

Movement

1 specs
Caliber
L791.4

Pricing

1 specs
MSRP
$5,800
$7,400

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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.

LONGINES SPIRIT FLYBACK PROTOTYPE

Owners widely praise the Longines Spirit Flyback Prototype for its attractive finishing, COSC-certified movement, and value as a flyback chronograph. Reviewers highlight its refined 39.5mm case and simplified dial, while some owners appreciate the reduced thickness and improved wearability compared to larger variants, with a lug-to-lug distance noted as potentially long for smaller wrists. The watch features a 68-hour power reserve and a bespoke L791.4 movement. However, the case thickness is a consistent point of discussion, with multiple sources citing 17mm, though some reviewers suggest thoughtful design makes it wear closer to 13.5-14mm. Owners are split on the dial's aesthetic, with some preferring previous configurations with gold subdial rings and concentric textures over the current flat matte dial and cut-off numbers. The leather strap is also noted as stiff and pinching.

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