Side by side

Sternglas Naos SolarvsSinn U50 HYDRO SDR with TEGIMENT option

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

Naos Solar
SternglasNaos Solar
MSRP $323
U50 HYDRO SDR with TEGIMENT option
SinnU50 HYDRO SDR with TEGIMENT option
MSRP $3,110

At a glance

18 of 29 specs differ
Diameter
Naos Solar38mm
U50 HYDRO SDR with TEGIMENT option41mm
Power Reserve
Naos Solar
U50 HYDRO SDR with TEGIMENT option40h
Water Resistance
Naos Solar50m
U50 HYDRO SDR with TEGIMENT option5,000m
MSRP
Naos Solar$323
U50 HYDRO SDR with TEGIMENT option$3,110

Full specifications

Case

7 specs
Category
Dress
Diver
Diameter
38mm
41mm
Thickness
10mm
11.8mm
Lug-to-Lug
42mm
Finish
Brushed and polished
bead-blasted
Water Resistance
50m
5000m
Caseback
Solid

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Inner
Underside
Dial Color
Black
Indices
Applied
Lume
Luminova Punkten
Luminescent

Movement

5 specs
Caliber
Seiko VJ76
Ronda 715 Li - SWISS MADE
Type
Solar
Quartz
Power Reserve
40h
Jewels
5
Complications
None
Date

Pricing

1 specs
MSRP
$323
$3,110

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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.

Sternglas Naos Solar

Owners widely praise the Sternglas Naos Solar for its elegant Bauhaus-inspired minimalist dial, slim profile, and value for money. The scratch-resistant curved sapphire crystal and functional date mechanism are noted as durable features, with one owner reporting good wear over a year. The solar power and accuracy are highlighted as practical advantages over automatic movements, which some find loud. However, opinions are split, with some owners finding the watch underwhelming and cheap-looking, like a toy, while others love its appearance in person and its clean, appealing design as a smartwatch alternative. The stock leather strap is described as decent but basic and potentially short for larger wrists, with one owner advising a third-party replacement for durability. One owner of a different variant noted the date font is too small to be useful.

Sinn U50 HYDRO SDR with TEGIMENT option

The Sinn U50 HYDRO SDR with TEGIMENT option is widely praised for its exceptional scratch resistance and legibility, with owners reporting no signs of wear after extended use. The oil-filled case contributes to extreme water resistance and a clear dial, while the fully tegimented construction offers a soft feel on the wrist. Reviewers note the compact 41mm size, though one owner found it did not wear as thin as expected due to its thickness. The lume is considered underwhelming by some, and the diving extension on the clasp can release too easily. It utilizes a quartz movement, which is noted as less accurate than previous thermo-compensated options. Overall, owners and reviewers rate the Sinn U50 HYDRO SDR with TEGIMENT option highly for its robust, legible, and virtually indestructible build at its price point.

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