Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's WatchvsThorn 40mm NH35A Diver Automatic 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.

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

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

Thorn 40mm NH35A Diver Automatic Watch at true scale

40mm NH35A Diver Automatic Watch

Diameter

39.5mm

40mm

Lug-to-Lug

47.2mm

lowest

47.8mm

Thickness

12.3mm

lowest

13.6mm

Water Resistance

200m

200m

Power Reserve

45h

n/a

MSRP

$2,800

$179

lowest

Movement

Seiko 6L37

PT5000

Case

4 specs
Diameter
39.5mm
40mm
Thickness
12.3mm
13.6mm
Lug-to-Lug
47.2mm
47.8mm
Material
Stainless Steel
316L stainless steel

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko 6L37
PT5000
Power Reserve
45h
0h
Jewels
26
0

Pricing

1 specs
MSRP
$2,800
$179
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Reviews

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

Seiko Prospex Marinemaster 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.

Thorn 40mm NH35A Diver Automatic Watch

Owners widely praise the Thorn 40mm NH35A Diver Automatic Watch for its impressive case finishing, featuring sharp polished chamfers and nice brushing, along with great lume and excellent wrist presence due to its 40mm case and ideal lug-to-lug measurement. The vintage aesthetic with yellowish hands and old-fashioned dial details is also a highlight, as is the explorer dial. The watch is considered well-made and offered at a great price, with the NH35 movement and 120-click bezel being impressive features. However, some owners note that the dial text on certain models does not match the logo style, and one owner reported the water resistance as 30M splash proof, not 300M. Some owners also report the watch as incredibly fragile. On balance, owners rate the Thorn 40mm NH35A Diver Automatic Watch highly for its finishing, vintage aesthetic, and value at the price point.