Longines HydroConquest 39 vs Tudor Black Bay 58

Side-by-side comparison of specifications and features

LonginesHydroConquest 39

L3.740.4.56.6

TudorBlack Bay 58

Navy

Key Differences

Best Value

Longines HydroConquest 39 (Ref. L3.740.4.56.6)

Starting from $1,094

Best Water Resistance

Longines HydroConquest 39 (Ref. L3.740.4.56.6)

300m (2x more)

Biggest Price Drop

Longines HydroConquest 39 (Ref. L3.740.4.56.6)

-24.6% in 30 days

Price Comparison

Longines HydroConquest 39

MSRP

$2,000

New

$1,094

Used

$1,052

Tudor Black Bay 58

MSRP

$4,000

New

$4,853

Used

$2,172

MSRP New (Amazon) Used (eBay)

Comparison of Longines HydroConquest 39, Tudor Black Bay 58
Specification	Longines HydroConquest 39	Tudor Black Bay 58
Pricing
MSRP	$2,000	$4,000
New Price	$1,094	$4,853
Used Price (Low)	$1,052	$2,172
Used Price (High)	$1,380	$31,758
30-Day Trend	↓ -24.6%	↑ +4.0%
Used Price Range	$1,052 - $1,380	$2,172 - $31,758
Identity
Reference	L3.740.4.56.6	Navy
Nickname	N/A	N/A
Style	Diver, Sports	Diver, Sports
Release Era	2020s	2020s
Dimensions
Diameter	39mm	39mm
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)	200m (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 Tudor Black Bay 58 can overlap on price or use case, but the buying decision usually comes down to water-ready utility versus dressier everyday wear, entry price versus premium finishing or specs. They both touch the diver and sports use case, so smaller spec differences can matter more than brand preference.

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 mechanical-watch enthusiasts, diver styling.

Tudor Black Bay 58

Tudor Black Bay 58 is a better fit for mechanical-watch enthusiasts, diver styling.

Key Differences

Movement and upkeep

Longines HydroConquest 39: automatic movement

Tudor Black Bay 58: 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

Tudor Black Bay 58: 39mm

Their size profiles are relatively close, so fit comes down to shape, weight, and how each watch sits on your wrist.

Water resistance

Longines HydroConquest 39: 300m

Tudor Black Bay 58: 200m

Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.

Price and value

Longines HydroConquest 39: $1,094

Tudor Black Bay 58: $2,730

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

Tudor Black Bay 58: 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

Tudor Black Bay 58: 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...

Swimming, beach use, or tougher daily wear is part of the plan.
You want the lower current entry price.

Choose Tudor Black Bay 58 If...

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 Tudor Black Bay 58 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 $1084 · Live listings

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

Tudor Black Bay 58

Check Price on AmazonOpens in new tab · Price may vary

Check Price on eBayFrom $2730 · 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.