Knot Watches AT1-40SSVvsSeiko Prospex Marinemaster 1965 Heritage Diver's Watch

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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 AT1-40SSV at true scale

AT1-40SSV

Seiko Prospex Marinemaster 1965 Heritage Diver's Watch at true scale

Prospex Marinemaster 1965 Heritage Diver's Watch

Diameter

40mm

39.5mm

Lug-to-Lug

n/a

47.2mm

Thickness

11mm

lowest

12.3mm

Water Resistance

200m

200m

Power Reserve

42h

45h

highest

MSRP

$628

lowest

$2,800

Movement

Miyota 9015

Seiko 6L37

Case

5 specs
Diameter
40mm
39.5mm
Thickness
11mm
12.3mm
Lug-to-Lug
n/a
47.2mm
Lug Width
n/a
20mm
Material
316L Stainless Steel
Stainless Steel

Crystal & Dial

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

Movement

3 specs
Caliber
Miyota 9015
Seiko 6L37
Power Reserve
42h
45h
Jewels
24
26

Pricing

1 specs
MSRP
$628
$2,800
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Reviews

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

Knot Watches AT1-40SSV

Owners widely praise the Knot AT1-40SSV for its versatile 40mm size and excellent wearability, with many appreciating its surprising lightness and the clean dial design. The lume is noted as strong, and accuracy is reported around +4 seconds per day. Some owners find the initial stiffness of the premium strap a minor issue, though its well-machined buckle is well-regarded. One owner flags the small crown as a significant drawback due to its size and placement. On balance, owners rate the Knot AT1-40SSV highly for its comfortable wearability and attractive dial at the price point.

Seiko Prospex Marinemaster 1965 Heritage Diver's Watch

The Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch is praised for its modern execution of a classic design, with reviewers noting the appealing 39.5mm case size and updated bracelet that improve wearability. Some reviewers mention the 6L37 movement has a 46-hour power reserve, with accuracy rated around -10/+15 seconds per day. A drawback identified by reviewers is the lack of tool-free micro-adjustment on the clasp. Overall, owners and reviewers find the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch to be a handsome re-interpretation of a beloved design, with its improved wearability being a key strength.

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