Seiko Prospex Sea 1968 Heritage Diver's GMTvsLongines HYDROCONQUEST

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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 at true scale

HYDROCONQUEST

Diameter

42mm

43mm

Lug-to-Lug

48.6mm

lowest

53.5mm

Thickness

12.9mm

11.9mm

lowest

Water Resistance

200m

300m

highest

Power Reserve

72h

72h

MSRP

$1,500

lowest

$2,000

Movement

Seiko 6R54

Longines L888

Case

5 specs
Diameter
42mm
43mm
Thickness
12.9mm
11.9mm
Lug-to-Lug
48.6mm
53.5mm
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

2 specs
Caliber
Seiko 6R54
Longines L888
Jewels
24
0

Pricing

1 specs
MSRP
$1,500
$2,000
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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

Owners widely praise the Longines HYDROCONQUEST for its attractive sunburst dials and near COSC accuracy, with one owner noting a movement losing only about 2 seconds per day. However, opinions are divided on the bracelet, with some finding it comfortable and featuring a useful slide-lock extension, while others criticize it for lacking micro-adjustments, having pinch-prone links, sharp lugs, and an uncomfortable feel. The screw-down crown operation is also a point of contention, described by some as inconvenient or difficult. On balance, owners rate the Longines HYDROCONQUEST highly for its striking dial and value, despite mixed views on its bracelet and crown usability.

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