Side by side

Longines LONGINES SPIRIT FLYBACK PROTOTYPEvsZelos Eagle 2

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

LONGINES SPIRIT FLYBACK PROTOTYPE
LonginesLONGINES SPIRIT FLYBACK PROTOTYPE
MSRP $7,400
Eagle 2
ZelosEagle 2
MSRP $899

At a glance

9 of 29 specs differ
Diameter
LONGINES SPIRIT FLYBACK PROTOTYPE42mm
Eagle 239mm
Power Reserve
LONGINES SPIRIT FLYBACK PROTOTYPE40h
Eagle 240h
Water Resistance
LONGINES SPIRIT FLYBACK PROTOTYPE100m
Eagle 2100m
MSRP
LONGINES SPIRIT FLYBACK PROTOTYPE$7,400
Eagle 2$899

Full specifications

Case

6 specs
Category
Chronograph
Pilot
Diameter
42mm
39mm
Thickness
17mm
11mm
Lug-to-Lug
49.5mm
39mm
Lug Width
22mm
20mm
Material
Stainless Steel
Titanium

Crystal & Dial

1 specs
Dial Color
Green
Anthracite

Movement

1 specs
Caliber
L791.4
La Joux-Perret G100

Pricing

1 specs
MSRP
$7,400
$899

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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.

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.

Zelos Eagle 2

Owners widely praise the Zelos Eagle 2's unique meteorite dial and titanium case, with one owner describing it as a "work of art" featuring a fully lumed dial and a scratch-resistant 1,200 Vickers hardness-coated case. The LaJoux Perret G100Soigne movement provides a 68-hour power reserve. Some owners, however, find the dial layout "ugly" and the font thick, while others note minor QC issues like misaligned markers. On balance, owners rate the Zelos Eagle 2 highly for its distinctive meteorite dial and titanium construction at its price point.

From video reviewers

The watch's compact size is a notable strength, with a 39mm diameter case and 11mm thickness making it suitable for a pilot's watch. A potential weakness is the lug-to-lug fit, which may be too large for smaller wrists. Reviewers disagree on the bezel, with one reviewer highlighting the Cerakote finish as a standout feature, while another mentions the watch's bezel in passing without comment.

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