Case #710 — Tudor Pelagos “2-Liner” Ref. 25500TN

Case #710 — Tudor Pelagos “2-Liner”
Ref. 25500TN

Status: Available
Condition: Excellent Pre-Owned
Scope: Box, Papers, and Cards

Case Notes

The original Pelagos was already one of Tudor’s most serious tool watches. The early 25500TN “2-Liner” may also be the cleanest version.

This is the first-generation Pelagos, powered by the ETA 2824-based automatic movement used before Tudor transitioned the collection to its manufacture calibre. That earlier movement architecture is what gives the watch its collector nickname: the dial carries only two lines of text above 6 o’clock instead of the denser layout found on later versions.

The result is a noticeably cleaner face.

Around it, the rest of the watch is pure purpose: a 42 mm titanium case, black dial, luminous ceramic bezel, helium escape valve, sapphire crystal, 500 meters of water resistance, and Tudor’s ingenious titanium bracelet with its self-adjusting spring-loaded clasp system.

This example dates from 2013 and presents in Excellent Pre-Owned condition. It includes its Box, Papers, and Cards and is currently sized for approximately a 7½-inch wrist.

The Evidence

Reference: 25500TN
Model: Pelagos
Generation: Early “2-Liner”
Year: 2013
Case: Titanium
Case Diameter: 42 mm
Case Thickness: Approximately 14 mm
Lug Width: 22 mm
Dial: Black
Crystal: Sapphire
Bezel: Unidirectional Dive Bezel
Crown: Screw-Down
Helium Escape Valve: Yes
Movement: ETA 2824-Based Automatic
Movement Type: Automatic
Frequency: 28,800 VPH
Jewels: 25
Power Reserve: Approximately 38 Hours
Functions: Hours, Minutes, Central Seconds, Date
Water Resistance: 500 meters / 1,640 feet
Bracelet: Titanium
Clasp: Tudor Self-Adjusting Folding Clasp
Bracelet Fit: Approximately 7½-inch Wrist
Condition: Excellent Pre-Owned
Included: Box, Papers, and Cards

Collector Provenance

The 25500TN is the original Pelagos.

Introduced before Tudor’s full move into manufacture movements, this reference carries the earlier ETA-based architecture and a much cleaner dial layout than the later in-house versions.

That difference is small on paper and immediately obvious on the wrist.

The later Pelagos added more certification and movement text to the lower half of the dial. The early watch simply leaves more negative space, which is why collectors commonly refer to it as the “2-Liner.”

It is also a relatively thinly traded reference today. 

Design Provenance

The Pelagos has always been much more utilitarian than the Black Bay.

The titanium case and bracelet keep weight down, while the square luminous markers, Snowflake handset, black dial, and matte surfaces give the watch a deliberately functional character.

The early 2-Liner dial strengthens that effect because it simply has less printing.

There is very little visual noise between the markers, hands, and date aperture.

The result is one of the most instrument-like watches Tudor has made.

Technical Provenance

The 25500TN uses an ETA 2824-based automatic movement running at 28,800 vibrations per hour with approximately 38 hours of power reserve.

The movement may be simpler than the later Tudor manufacture calibre, but it is extremely well understood and widely serviceable.

The case specification remains serious: 500 meters of water resistance, helium escape valve, screw-down crown, sapphire crystal, and a unidirectional dive bezel.

The titanium bracelet is one of the standout features of the entire Pelagos line.

Its self-adjusting clasp uses a spring-loaded mechanism designed to expand and contract with changes in wrist size or diving conditions, making it far more sophisticated than a conventional fixed clasp.

From the Case File

This is the early Pelagos configuration collectors tend to notice.

The ETA movement, sparse 2-Liner dial, titanium construction, and 500-meter specification give the watch a very different character from the later manufacture-movement generation.

Case 710 dates from 2013 and presents in Excellent Pre-Owned condition.

It includes its Box, Papers, and Cards and is currently sized for approximately a 7½-inch wrist.

Buy with Confidence

BST guarantees the authenticity of every watch we sell and provides a 30-day mechanical performance guarantee under normal use.

Accuracy may vary with age and service history, and water resistance is not guaranteed unless specifically stated and pressure-tested.

BST Verdict

The original Pelagos, and arguably the cleanest.

The early 2-Liner dial, ETA-based movement, titanium case and bracelet, self-adjusting clasp, helium valve, and 500-meter rating make the 25500TN one of Tudor’s most purposeful modern tool watches.

Case 710 adds a 2013 date, Excellent condition, and complete BPC presentation to a discontinued configuration that remains meaningfully different from the Pelagos models that followed.

Every case deserves a closer look.