Longines HydroConquest 39 vs Longines HydroConquest GMT

Side-by-side comparison of specifications and features

LonginesHydroConquest 39

L3.740.4.56.6

LonginesHydroConquest GMT

L3.890.4.56.6

Key Differences

Best Value

Longines HydroConquest 39 (Ref. L3.740.4.56.6)

Starting from $1,094

Biggest Price Drop

Longines HydroConquest 39 (Ref. L3.740.4.56.6)

-38.7% in 30 days

Price Comparison

Longines HydroConquest 39

MSRP

$2,000

New

$1,094

Used

$1,052

Longines HydroConquest GMT

MSRP

$3,350

New

$2,475

Used

$2,423

MSRP New (Amazon) Used (eBay)

Comparison of Longines HydroConquest 39, Longines HydroConquest GMT
Specification	Longines HydroConquest 39	Longines HydroConquest GMT
Pricing
MSRP	$2,000	$3,350
New Price	$1,094	$2,475
Used Price (Low)	$1,052	$2,423
Used Price (High)	$1,562	$2,826
30-Day Trend	↓ -38.7%	↑ +7.0%
Used Price Range	$1,052 - $1,562	$2,423 - $2,826
Identity
Reference	L3.740.4.56.6	L3.890.4.56.6
Nickname	N/A	N/A
Style	Diver, Sports	Diver, Sports
Release Era	2020s	2020s
Dimensions
Diameter	39mm	41mm
Thickness	N/A	N/A
Lug Width	N/A	N/A
Lug to Lug	N/A	N/A
Movement
Movement	Automatic	Automatic
Power Reserve / Battery	N/A	N/A
Accuracy	N/A	N/A
Case
Case Material	Stainless Steel	Stainless Steel
Crystal	Sapphire Crystal	Sapphire Crystal
Water Resistance	300m (diving)	300m (diving)
Bezel	Unidirectional rotating	Unidirectional rotating
Dial
Dial Color	Black	Black
Luminous	Yes	Yes
Community
Review Rating	N/A	N/A
In Collections	N/A	N/A
On Wishlists	N/A	N/A
Forum Threads	N/A	N/A

Quick Summary

This Longines HydroConquest 39 vs Longines HydroConquest GMT comparison is less about a universal winner and more about wrist presence versus easier fit, entry price versus premium finishing or specs. Start with fit first — case width and lug-to-lug usually matter more than secondary features if wrist comfort is a concern.

How to choose

The biggest practical difference is usually movement and upkeep. Start with wrist fit and movement preference, then use water resistance and price to break the tie.

Longines HydroConquest 39

Longines HydroConquest 39 is a better fit for smaller wrists, mechanical-watch enthusiasts, diver styling.

Longines HydroConquest GMT

Longines HydroConquest GMT is a better fit for buyers who want more wrist presence, mechanical-watch enthusiasts, diver styling.

Key Differences

Movement and upkeep

Longines HydroConquest 39: automatic movement

Longines HydroConquest GMT: automatic movement

Both use the same movement type, so maintenance differences are limited and fit or feature details should decide the purchase.

Size and wearability

Longines HydroConquest 39: 39mm

Longines HydroConquest GMT: 41mm

Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features.

Water resistance

Longines HydroConquest 39: 300m

Longines HydroConquest GMT: 300m

Water resistance is similar on paper, so focus on fit, features, and price instead.

Price and value

Longines HydroConquest 39: $1,094

Longines HydroConquest GMT: $2,475

There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.

Style and use case

Longines HydroConquest 39: diver

Longines HydroConquest GMT: diver

Both lean into a similar diver use case — the choice is more about fit, features, and price than category.

Crystal and materials

Longines HydroConquest 39: sapphire crystal · steel

Longines HydroConquest GMT: sapphire crystal · steel

Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.

Choose Longines HydroConquest 39 If...

You want a smaller case footprint on the wrist.
You want the lower current entry price.

Choose Longines HydroConquest GMT If...

You prefer more dial presence and a larger case feel.
You are comfortable paying more for a stronger feature set.

Price and Value Notes

Longines HydroConquest 39 is often the value play at current pricing, while Longines HydroConquest GMT makes more sense if you will use its extra features regularly.

There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.

Where to Check Deals

Check current deals on Amazon and eBay using the buttons below — listing prices, seller quality, and condition can change quickly.

Check current deals on Amazon and eBay

Prices change often, so compare the latest listings and condition options before you buy.

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Longines HydroConquest 39

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $1104 · Live listings

Affiliate links — WatchCompared earns a commission on qualifying purchases. This doesn't affect your price.

Longines HydroConquest GMT

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $2718 · Live listings

Affiliate links — WatchCompared earns a commission on qualifying purchases. This doesn't affect your price.

Comparison FAQ

Which one is better for smaller wrists?

Longines HydroConquest 39 — it is 39mm wide versus 41mm.

Which is better for swimming or rough daily wear?

They are rated the same, so water resistance will not decide this. Choose on strap material and how much you mind scratching the case.

Is the more expensive one worth it?

Longines HydroConquest 39 is the value pick at roughly $1381 less. Pay more only if a specific difference above matters to you — otherwise the cheaper one is the smarter buy. Confirm live listings, since marketplace pricing moves.