Knot Watches ATC-40vsSeiko Prospex Speedtimer

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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.

Knot Watches ATC-40 at true scale

ATC-40

Seiko Prospex Speedtimer at true scale

Prospex Speedtimer

Diameter

40mm

39mm

Lug-to-Lug

n/a

45.5mm

Thickness

13.5mm

13.3mm

lowest

Water Resistance

100m

100m

Power Reserve

45h

n/a

MSRP

$1,257

$725

lowest

Movement

Seiko NE88

Seiko V192

Case

5 specs
Diameter
40mm
39mm
Thickness
13.5mm
13.3mm
Lug-to-Lug
n/a
45.5mm
Lug Width
n/a
20mm
Material
316L Stainless Steel
Stainless Steel

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Red
n/a
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Seiko NE88
Seiko V192
Type
Automatic
Quartz
Power Reserve
45h
0h

Pricing

1 specs
MSRP
$1,257
$725
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Knot Watches ATC-40

Knot Watches ATC-40 owners widely praise its case finishing, with one noting Sallaz polishing that distinguishes it from competitors, and appreciate the value and craftsmanship at its price point. The watch is described as well-made with a discrete dial featuring subtle gold and silver powder, and a modern look complemented by a deep burgundy textured dial and refined mesh bracelet. While some find it wears smaller than its 40mm case size, one owner dislikes the 18mm lug width, and another notes the premium strap is stiff but well-made with a nice deployment buckle. A reviewer also points out the very small crown appears undersized and poorly placed near the bottom of the case. Overall, owners rate the Knot Watches ATC-40 highly for its craftsmanship and value, with its distinctive case finishing being a significant draw.

Seiko Prospex Speedtimer

Owners widely praise the Seiko Prospex SPEEDTIMER for its vintage-inspired design and versatility as an everyday watch. Some owners find the 39mm case size comfortable and well-suited for active use. Reviewers note the solar-powered V192 movement offers a six-month power reserve. Criticisms include the watch's thickness, which some find to be between 13-15mm, and the 24-hour subdial. The price point is a recurring point of contention, with some owners questioning the value for a solar quartz chronograph. On balance, owners and reviewers find the Seiko Prospex SPEEDTIMER a capable and attractive watch, with its design being the most frequently cited positive attribute.

From video reviewers

The Seiko Prospex SPEEDTIMER's solar movement provides reliable power without battery replacements and accurate timekeeping, with a claimed accuracy of ±15 seconds per month. A notable trade-off is the watch's slightly thicker profile and somewhat lacking lume brightness. Reviewers disagree on whether the bezel action is smooth and clicky, with one reviewer praising it and the other not mentioning it.