Echo/Neutra 1956 3HvsMarathon GSAR (Government Search & Rescue) Diver's Automatic
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

1956 3H

GSAR (Government Search & Rescue) Diver's Automatic
Diameter
40mm
41mm
Lug-to-Lug
46mm
lowest
48mm
Thickness
11.9mm
lowest
14mm
Water Resistance
100m
300m
highest
Power Reserve
41h
n/a
MSRP
$1,025
lowest
$2,500
Movement
Sellita SW200-1
Sellita SW200-1
Case
7 specsCrystal & Dial
4 specsMovement
4 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Echo/Neutra 1956 3H for its exceptionally well-executed bracelet, with one owner comparing it favorably to a Rolex Oyster. The watch is noted for its unique blend of vintage tool-watch and mid-century design, featuring a dramatic box-domed sapphire crystal and a gray dial that exceeds build quality expectations. Legibility in low light presents a challenge due to the fixed, lumed bezel and non-lumed dial, and some may find the branding off-putting. Overall, owners rate the Echo/Neutra 1956 3H highly for its unique character and comfortable wearability, driven by its exceptional bracelet and distinctive design.
The case finishing and vintage aesthetic are consistently praised. The 100m water resistance and Sellita SW200-1 movement are also noted strengths. Reviewers did not reach a consensus on any weaknesses.
The Marathon GSAR (Government Search & Rescue) Diver's Automatic is widely praised as a versatile and well-made tool watch, with reviewers highlighting its legibility, utilitarian build, and comfort. Owners appreciate the tritium gas tubes for exceptional illumination in darkness, a feature noted as superior to some alternatives. The 41mm case size is considered ideal by some, though one owner found it wore tall and bumped on objects. While the watch is generally seen as a solid value for a Swiss-made tool watch, some owners have reported quality control issues requiring warranty service. Overall, owners and reviewers rate the Marathon GSAR (Government Search & Rescue) Diver's Automatic highly for its robust build and constant legibility from tritium.
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