Longines HydroConquest 39 vs Longines HydroConquest

Side-by-side comparison of specifications and features

LonginesHydroConquest 39

L3.740.4.56.6

LonginesHydroConquest

L3.781.4.96.6

Key Differences

Best Value

Longines HydroConquest (Ref. L3.781.4.96.6)

Starting from $1,417

Price Comparison

Longines HydroConquest 39

MSRP

$2,000

New

$2,675

Used

$1,314

Longines HydroConquest

MSRP

$1,600

New

$1,640

Used

$1,315

MSRP New (Amazon) Used (eBay)

Comparison of Longines HydroConquest 39, Longines HydroConquest
Specification	Longines HydroConquest 39	Longines HydroConquest
Pricing
MSRP	$2,000	$1,600
New Price	$2,675	$1,640
Used Price (Low)	$1,314	$1,315
Used Price (High)	$2,600	$1,562
30-Day Trend	↑ +3.1%	↑ +18.5%
Used Price Range	$1,314 - $2,600	$1,315 - $1,562
Identity
Reference	L3.740.4.56.6	L3.781.4.96.6
Nickname	N/A	N/A
Style	Diver, Sports	Diver, Sports
Release Era	2020s	2010s
Dimensions
Diameter	39mm	41mm
Thickness	N/A	12.2mm
Lug Width	N/A	21mm
Lug to Lug	N/A	47.5mm
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	Blue
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

Longines HydroConquest 39 and Longines HydroConquest can look close on a spec sheet, yet the tradeoffs that matter most are usually wrist presence versus easier fit. Treat it as a value-versus-upgrade decision — confirm the extra spend solves a problem you will notice every week.

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

Longines HydroConquest 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: 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: 41mm · L2L 47.5mm

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: 300m

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

Price and value

Longines HydroConquest 39: $2,000

Longines HydroConquest: $1,417

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: 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: 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 are comfortable paying more for a stronger feature set.

Choose Longines HydroConquest If...

You prefer more dial presence and a larger case feel.
You want the lower current entry price.

Price and Value Notes

Longines HydroConquest is often the value play at current pricing, while Longines HydroConquest 39 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 $1843 · Live listings

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Longines HydroConquest

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $1417 · 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?

Start with case width and lug-to-lug. The watch that looks smaller on paper is often the safer choice, but lug shape and thickness still affect how it wears.

Which is better for swimming or rough daily wear?

Use the water resistance row as the first filter. Higher ratings generally give more flexibility for swimming and water exposure, but strap choice and overall condition still matter.

Should I choose based on price alone?

Price matters, but the better buy is the watch that matches your fit, feature priorities, and use case. Check live listings first, then decide whether the price gap actually changes the ownership experience.