Seiko Prospex Sea 1968 Heritage Diver's GMT Limited EditionvsThorn Marine 200 Master Diver

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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 Sea 1968 Heritage Diver's GMT Limited Edition at true scale

Prospex Sea 1968 Heritage Diver's GMT Limited Edition

Thorn Marine 200 Master Diver at true scale

Marine 200 Master Diver

Diameter

42mm

42mm

Lug-to-Lug

48.6mm

48.5mm

lowest

Thickness

13.3mm

12.4mm

lowest

Water Resistance

300m

highest

200m

Power Reserve

72h

n/a

MSRP

$1,750

$179

lowest

Movement

Seiko 6R54

Seiko NH35

Case

4 specs
Thickness
13.3mm
12.45mm
Lug-to-Lug
48.6mm
48.5mm
Material
Stainless Steel
316L stainless steel
Water Resistance
300m
200m

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko 6R54
Seiko NH35
Power Reserve
72h
0h
Jewels
24
0

Pricing

1 specs
MSRP
$1,750
$179
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Reviews

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

Seiko Prospex Sea 1968 Heritage Diver's GMT Limited Edition

The Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition is widely praised for its excellent quality and finishing for its price, with reviewers highlighting its beautiful case, bracelet, and Lumibrite lume. Owners appreciate the comfortable 42mm case size and the 4 o'clock crown position. The watch features a sapphire crystal and uses the in-house 6R54 automatic movement with a three-day power reserve. Some reviewers note that the GMT function is secondary and that the bezel clicks are quieter than expected. The 4:30 date window splits opinion among enthusiasts, and it is described as a "caller GMT" rather than a true "traveller GMT." Overall, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition highly for its excellent value, quality finishing, and comfortable wearability.

Thorn Marine 200 Master Diver

Owners widely praise the Thorn Marine 200 Master Diver Watch for its 200m water resistance and screw-down crown, making it suitable for swimming and diving. The bracelet on this Pelagos-style model is considered excellent, and one owner finds the watch comfortable and a good value for daily wear at $131. However, some find the lume only okay and the bezel a bit stiff, while another owner notes the Thorn text on the dial is unnecessary clutter. On balance, owners rate the Thorn Marine 200 Master Diver Watch highly for its robust water resistance and comfortable, well-received bracelet at its price point.

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