Longines Master Collection Master Collection Power Reserve

Reference L2.666.4.51.5

About this watch

The Longines Master Collection Power Reserve, reference L2.666.4.51.5, is a masterpiece of watchmaking that embodies the perfect balance between technical innovation and timeless aesthetics. The black guilloche dial with intricate pattern catches the light beautifully, giving the watch a dynamic quality. The 42 mm stainless steel case feels robust yet refined, suitable for various occasions. The sapphire crystal offers excellent scratch resistance, while the feuille hands add a vintage flair to the design. At its heart is the Longines caliber L602, an automatic movement with 21 jewels and a frequency of 28,800 beats per hour, offering reliable and accurate timekeeping experience. The power reserve indicator adds a layer of practicality, while the date function at 6 o'clock is easy to read without cluttering the dial. With a water resistance rating of 30 meters, this watch can withstand occasional rain but isn't designed for diving. It comes with a high-quality leather strap that feels incredibly comfortable on the wrist and weighs in at just the right amount, making it an excellent choice for long wear.

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Key Features

Longines caliber L602 automatic movement
42 mm stainless steel case with sapphire crystal
Black guilloche dial with intricate pattern and feuille hands
Power reserve indicator and date function at 6 o'clock
30 meters water resistance and high-quality leather strap

Specifications

Brand

Longines

Family

Master Collection

Model

Master Collection Power Reserve

Reference

L2.666.4.51.5

Movement

l602

Movement Features

Hours, Minutes, Seconds
Date
Power Reserve Indicator

Case

Stainless Steel 42mm

Dial Color

Black

Crystal

Sapphire

Water Resistance

Current Listings

REDUCED PRICE! Longines Master Collection Moon Phase (L29094517) ($1600)

Longines - L29094517 · $1,600

This Longines Master Collection Moon Phase watch has been worn minimally and is in terrific working order. It features a scratch-free crystal, case, and leather strap.

Condition: Like new - minimal wear
Purchase Price: 2350
Asked Price Drop: 150
Shipping Included: true

Posted at

Jan 28, 2026, 11:24 PM

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Longines Master Collection Moon Phase Chronograph (40mm) L2.673.4.78.3

Longines - L2.673.4.78.6 · $2,250

A Longines Master Collection Moon Phase Chronograph with a 40mm case, automatic caliber L687, and various complications including date, moon phase display, and chronograph.

Case size: 40mm diameter
Thickness: 14.3mm
Movement frequency: 28'800 VPH

Posted at

Jan 27, 2026, 8:44 PM

Active

View listing on r/WatchExchange

Longines Master Collection Moon Phase (L29094517) ($1700)

Longines - L29094517 · $1,700

A Longines Master Collection Moon Phase watch with a minimal owner history, kept in great condition and complete with original papers, box, and warranty card. The watch is sold with shipping included.

Condition: Like new with minimal wear
Year purchased: 2021
Original price: 2350

Posted at

Jan 22, 2026, 10:04 PM

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2025 Longines Master Collection Moonphase L29094926 Full Set Excellent Condition

Longines - L29094926 · $1,900

This Longines Master Collection Moonphase features a 40mm automatic case with sapphire crystal and luminous hands.

Condition: Excellent (9.9/10)
Case size: 40mm diameter

Posted at

Jan 20, 2026, 5:56 PM

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Longines Master Collection Moonphase Chronograph 40mm L2.673.4.78.6

Longines - L2.673.4.78.6 · $1,950

This Longines Master Collection Moonphase Chronograph features a 40mm case, column wheel chronograph, and triple calendar (date, day, month). It also includes the box and papers.

Condition: Pre-owned, worn, some scratches and scuffs
Case Size: 40mm
Bracelet Links: 3 extra links
Box Condition: damaged, one flap falling off (taped)

Posted at

Jan 18, 2026, 5:11 PM

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