Seiko Prospex SeavsLongines HydroConquest GMT

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Seiko Prospex Sea

MSRP $1,100

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Longines HydroConquest GMT

Ref. L3.790.4.06.6·MSRP $3,350

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Buy from Longines Used on eBay

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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.

Prospex Sea

HydroConquest GMT

Diameter

Across the case, crown excluded.

41.3mm

41mm

Lug-to-Lug

The number that decides fit.

48.2mm

lowest

49.4mm

Thickness

How it sits under a cuff.

12.5mm

lowest

12.9mm

Water Resistance

Rated in meters.

300m

Power Reserve

How long it runs off the wrist.

72h

n/a

MSRP

Sticker price, new.

$1,100

lowest

$3,350

Movement

What drives the hands.

Seiko 6R55

L844.5

Spec

Prospex Sea

HydroConquest GMT

Case

4 specs

Diameter

41.3mm

41mm

Thickness

12.5mm

12.9mm

Lug-to-Lug

48.2mm

49.4mm

Lug Width

20mm

21mm

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 6R55

L844.5

Power Reserve

72h

Jewels

Pricing

1 specs

MSRP

$1,100

$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

Owners and reviewers widely praise the Seiko Prospex Sea for its robust build quality and fair price, with many noting its comfortable silicone strap. Some owners find the watch's size, thickness, and weight to be uncomfortable for smaller wrists, while others consider the size perfect. The consensus is that the Seiko Prospex Sea offers excellent value and build quality for its price.

A Blog to Watch·6

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.