Seiko Prospex Sea 1968 Heritage Diver's GMTvsLongines HydroConquest GMT

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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 at true scale

Prospex Sea 1968 Heritage Diver's GMT

Longines HydroConquest GMT at true scale

HydroConquest GMT

Diameter

42mm

41mm

Lug-to-Lug

48.6mm

lowest

49.4mm

Thickness

12.9mm

12.9mm

Water Resistance

200m

300m

highest

Power Reserve

72h

n/a

MSRP

$1,500

lowest

$3,350

Movement

Seiko 6R54

L844.5

Case

4 specs
Diameter
42mm
41mm
Lug-to-Lug
48.6mm
49.4mm
Lug Width
20mm
21mm
Water Resistance
200m
300m

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko 6R54
L844.5
Power Reserve
72h
0h
Jewels
24
0

Pricing

1 specs
MSRP
$1,500
$3,350
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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

The Seiko Prospex Sea 1968 Heritage Diver's GMT is widely praised for its build quality, finishing, and value, with owners noting its comfortable wearability and attractive aesthetic, particularly the silver/white sunray dial and blue ceramic bezel. The improved bracelet clasp with excellent micro-adjustment is a recurring positive point. Some owners report accuracy figures of +3 seconds per day or +/- 5 seconds per day, exceeding the movement's stated range. However, the GMT functionality is considered secondary to its dive watch capabilities by some, with the GMT scale being difficult to read and the caller-style GMT movement being a drawback for certain users. The dial contrast is also noted as lacking by some, and the crown at 4 o'clock is undesirable for a few. On balance, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT highly for its blend of dive watch character and GMT functionality, offering significant features for its price.

Longines HydroConquest GMT

Owners widely praise the Longines HYDROCONQUEST GMT for its excellent finishing, robust build quality, and comfortable wearability, with some finding its finish superior to higher-priced competitors. The smooth winding action and value proposition are also frequently highlighted. Some owners note that the GMT hour markers are difficult to read, and the date wheel does not always match the dial color. A few reviewers mention a sharp folding clasp and a bezel with bounce-back, while others prefer a smaller case size. Overall, owners and reviewers rate the Longines HYDROCONQUEST GMT highly for its impressive build quality and value as a travel-oriented dive watch.

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