Longines Master Collection Master Collection Power Reserve

Reference L2.666.4.51.6

Longines Master Collection Power Reserve

About this watch

The Longines Master Collection Power Reserve (L2.666.4.51.6) is a masterpiece of elegance and precision. Founded in 1832, Longines has a rich heritage in watchmaking, combining traditional techniques with modern advancements. The round stainless steel case exudes durability and sophistication, while the sleek black guilloche dial catches the light beautifully. The automatic movement, based on the reliable ETA 2897, ensures precise timekeeping with a frequency of 28800 vibrations per hour. One of the standout features is the power reserve indicator, letting you know how much power is left in the watch's reserve—up to 42 hours. With its blend of classic design, reliable functionality, and reasonable pricing, this watch is perfect for everyday wear, suitable for both casual and formal occasions. Whether you're dressing up for a gala or simply heading to the office, this watch is the perfect accessory to keep you punctual and stylish.
Buy Now on Jomashop
This is an affiliate link

Key Features

  • Elegant round stainless steel case
  • Sleek black guilloche dial
  • Automatic movement with 28800 vibrations per hour
  • Power reserve indicator up to 42 hours
  • Durable water resistance of 30 meters
  • Classic Roman numeral indexes and feuille hands
  • Affordable luxury price point

Specifications

Brand
Longines
Family
Master Collection
Model
Master Collection Power Reserve
Reference
L2.666.4.51.6
Movement
l602
Movement Features
  • Hours, Minutes, Seconds
  • Date
  • Power Reserve Indicator
Case
Stainless Steel 42mm
Dial Color
Black
Crystal
Sapphire
Water Resistance
30

Current Listings

[WTS] Longines Master Collection Triple Date Moonphase Chronograph 42mm with box - $1,890

Longines Master Collection Triple Date Moonphase Chronograph 42mm with box - $1,890

Longines - L2-773-4-78-3 · $1,890
Up for sale is my Longines Master Collection, Triple Date Moonphase Chronograph 42mm. The watch has a steel case, chronograph function, moonphase complication, and comes with its original box.

  • Condition: Great condition with minimal marks on the case sides and caseback, light hairlines on the high polished bezel and bracelet centerlinks/sides
  • Case size: 42mm
  • Bracelet size: up to 7-7.25inch wrists depending on wrist shape
Posted at
May 19, 2026, 8:56 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection Complete Calendar Chronograph ref. L2.773.4.78.6 | Excellent Condition (Full Set: Box, Papers, Card, Purchase Invoices With International Warranty Until 2029) | $2400

Longines Master Collection Complete Calendar Chronograph ref. L2.773.4.78.6 | Excellent Condition (Full Set: Box, Papers, Card, Purchase Invoices With International Warranty Until 2029) | $2400

Longines - L2.773.4.78.6 · $2,400
Up for sale is the Longines Master Collection Complete Calendar Chronograph ref. L2.773.4.78.6, a traditional Swiss watch with a lot of mechanical charm packed into a single piece.

  • Condition: Excellent
  • Case Size: 42mm diameter
  • Thickness: 14.2mm
  • Movement Type: Automatic Chronograph
Posted at
May 18, 2026, 11:14 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection Salmon Dial 38.5mm L2.843.4.93.2 Full Set

Longines Master Collection Salmon Dial 38.5mm L2.843.4.93.2 Full Set

Longines - L2.843.4.93.2 · $1,800
The Longines Master Collection features a stunning salmon dial with black Arabic numerals and blued/black polished hands, giving it an elegant vintage-inspired look.

  • Condition: Excellent / barely worn
  • Case size: 38.5mm
  • Thickness: 10.2mm
  • Movement: Longines Caliber L893
Posted at
May 18, 2026, 10:34 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection L2.893.4.78.6. 42mm Black Dial Automatic on Bracelet Full Kit - $1,425

Longines Master Collection L2.893.4.78.6. 42mm Black Dial Automatic on Bracelet Full Kit - $1,425

Longines - L2.893.4.78.6 · $1,425
This Longines Master Collection automatic watch features a stainless steel case, black textured dial with Roman numeral hour markers, and date display at 3 o'clock. It comes as a full kit with box, papers, booklet, and accessories.

  • Condition: Pre-owned in very good overall condition
  • Case size: 42mm
  • Movement type: Automatic
  • Water resistance: 30m
Posted at
May 15, 2026, 3:17 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection 40mm Rose Gold L2.793.5.79.7 w Box $1900

Longines Master Collection 40mm Rose Gold L2.793.5.79.7 w Box $1900

Longines - L2.793.5.79.7 · $1,900
A rose gold dress watch with a 40mm case, available as a standalone timepiece or paired with its matching 18K rose gold bracelet.

  • Condition: Good shape
  • Material: Rose Gold
  • Bracelet material: 18K Rose Gold
Posted at
May 14, 2026, 3:07 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection World Time Ref. L2.631.4.70.6 | Excellent Condition (Box, Booklet, Card) | $1550

Longines Master Collection World Time Ref. L2.631.4.70.6 | Excellent Condition (Box, Booklet, Card) | $1550

Longines - L2.631.4.70.6 · $1,550
The Longines Master Collection World Time Ref. L2.631.4.70.6 is a modern travel watch with a stainless steel case, silver barleycorn dial, and world-time city ring.

  • Condition: Excellent
  • Case size: 38.5mm diameter
  • Bracelet length: up to 20cm (8 inches)
  • Movement: Longines Calibre L635 (based on ETA 2824-2 with GMT/world-time complication)
Posted at
May 10, 2026, 10:47 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection Moonphase L2.909.4.78 — 40mm — Full Kit — $1,699 Shipped 🔥

Longines Master Collection Moonphase L2.909.4.78 — 40mm — Full Kit — $1,699 Shipped 🔥

Longines - L2.909.4.78 · $1,699
A Longines Master Collection Moonphase watch in a 40mm case, featuring a moon phase display.

  • Condition: Good overall, with light hairlines throughout.
  • Case size: 40mm
  • Shipping options: FedEx 2-Day fully insured (+$15 overnight)
  • Shipping location: Chicago
Posted at
May 10, 2026, 7:59 PM
Active
View listing on r/WatchExchange
[WTS] LONGINES MASTER COLLECTION MOONPHASE 42mm

LONGINES MASTER COLLECTION MOONPHASE 42mm

Longines - L2.919.4.92.6
A Longines Master Collection Moonphase watch with a 42mm diameter and moon phase functionality.

  • Condition: New
  • Case Size: 42mm diameter
  • Box And Papers: true
Posted at
May 9, 2026, 4:10 PM
Active
View listing on r/WatchExchange
[WTS] 2022 Longines Master Collection L26734920 Moonphase Blue dial - Box + Papers

2022 Longines Master Collection L26734920 Moonphase Blue dial - Box + Papers

Longines - L26734920 · $2,890
The Longines Master Collection is an elegant and highly regarded automatic wristwatch that blends classic watchmaking with refined complications. It features a blue dial with a full calendar display, moonphase display, and running seconds.

  • Condition: attractive condition with honest signs of previous wear
  • Case size: 42mm diameter
  • Movement type: automatic
Posted at
May 8, 2026, 2:46 PM
Active
View listing on r/WatchExchange