ALATO Timescope Automatic 100m 39.8mmvsTuseno Shellback
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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.

Timescope Automatic 100m 39.8mm

Shellback
Diameter
39.8mm
40mm
Lug-to-Lug
n/a
47mm
Thickness
10.9mm
lowest
11.9mm
Water Resistance
100m
200m
highest
Power Reserve
38h
n/a
MSRP
$800
lowest
$840
Movement
Sellita SW200-1
Sellita SW200-1
Case
5 specsCrystal & Dial
2 specsMovement
1 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the ALATO Timescope Automatic 100m 39.8mm for its slim and sleek wearability, noting its sub-11mm thickness and 45.5mm lug-to-lug measurement. The use of a Sellita SW200-1b movement is also a point of appreciation, with one commenter preferring it over a Miyota 9 series. The watch features a sapphire crystal and Super-LumiNova BGW9 lume. On balance, owners rate the ALATO Timescope Automatic 100m 39.8mm highly for its comfortable dimensions and the quality of its movement.
Tuseno Shellback owners and reviewers widely praise its outstanding value and brilliant execution, highlighting its well-laid-out dial, crisp finishing, and balanced design. The sandwich dial, particularly the white and blue variants, is a frequent point of admiration, with one owner noting the lume appears light blue. The watch offers a substantial feel at 153 grams on the bracelet and a comfortable 40mm diameter, featuring a toolless micro-adjustment mechanism. While one reviewer noted a stiff bezel action, another owner described exceptionally crisp bezel action with zero play. Sources mention a Sellita SW200-1 or Ronda R150 movement, with one noting the Ronda's stated accuracy of ±12 seconds per day and 40-hour power reserve. Overall, owners and reviewers rate the Tuseno Shellback highly for its exceptional value and standout dial design.
The build quality is cited as a significant strength. Availability is a weakness, with stock running low.
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