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

Longines Master Collection - Retrograde - Silver "barleycorn" dial - Sun and Moon + Moon-phase - 44mm - With Card

Longines - Master Collection Retrograde · $2,500

A highly complicated Longines Master Collection Retrograde watch featuring a silver 'barleycorn' dial and a self-winding mechanical movement. It includes functions such as GMT moonphase, retrograde hands, small seconds, 24-hour second time zone, and a day-night indicator.

Condition: Excellent, works perfectly with no issues
Size: 44mm diameter
Lug width: 22mm
Water resistance: 3 bar

Posted at

Mar 25, 2026, 2:49 PM

Active

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Longines Master Collection L2.773.4.78.3 Moonphase Automatic Box and Papers

Longines - L2.773.4.78.3 · $2,190

The Longines Master Collection L2.773.4.78.3 is an elegant automatic wristwatch featuring a white dial, full calendar display, moonphase display, and running seconds.

Condition: Excellent, with light signs of careful wear on case and crystal
Case size: 42mm
Movement accuracy: +8 seconds per day
Bracelet/strap material: leather

Posted at

Mar 19, 2026, 2:37 PM

Active

View listing on r/WatchExchange

Longines Master Collection - Retrograde - Silver "barleycorn" dial - Sun and Moon + Moon-phase - 44mm - Comes With Card

Longines - Master Collection Retrograde · $2,500

This Longines Master Collection Retrograde features a complex set of functions including GMT Moonphase, Self winding mechanical movement, and retrograde hand displays for day, date, and second time zone. It also includes a moonphase display and day/night indicator.

Condition: Used, works perfectly with no issues
Case Size: 44mm without crown
Lug Width: 22mm
Movement: Self winding mechanical, 28'800 vibrations per hour, 48 hours power reserve

Posted at

Mar 18, 2026, 1:54 PM

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Longines Master Collection L2.708.4.51.6 - $1099 - DHL

Longines - L2.708.4.51.6 · $1,099

This Longines Master Collection features a refined black dial with Roman numeral indices, a power reserve indicator, and a timeless aesthetic.

Condition: Very Good (9.5/10)
Case size: 38.5mm diameter
Material: 316L Stainless Steel
Movement: Automatic Caliber L602.2, 28,800 vibrations per hour, 42 hours power reserve

Posted at

Mar 15, 2026, 3:16 PM

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