Longines Master Collection Master Collection Power Reserve

Reference L2.666.6.78.5

Longines Master Collection Power Reserve

About this watch

The Longines Master Collection Power Reserve is a magnificent blend of elegance, functionality, and timeless design. This luxury timepiece tells time with precision, looks stunning on the wrist, and offers a glimpse into the artistry of Swiss watchmaking. Crafted from yellow gold and featuring a beige guilloche dial, this 42 mm round case watch exudes sophistication and charm. The Longines caliber L602 automatic movement, based on the renowned ETA 2897, boasts a power reserve of 42 hours and 21 jewels for smooth operation. With sapphire glass and a water resistance rating of 30 meters, this watch is suitable for everyday wear. Whether you're at the office or out for a casual evening, this watch feels just right. It's an investment that's sure to pay off in style and performance, perfect for collectors, professionals, or anyone looking to elevate their style.
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Key Features

  • Yellow gold casing
  • 42 mm round case
  • Beige guilloche dial
  • Sapphire glass
  • Automatic movement (Longines caliber L602)
  • Power reserve of 42 hours
  • 21 jewels for smooth operation
  • Water resistance rating of 30 meters

Specifications

Brand
Longines
Family
Master Collection
Model
Master Collection Power Reserve
Reference
L2.666.6.78.5
Movement
l602
Movement Features
  • Hours, Minutes, Seconds
  • Date
  • Power Reserve Indicator
Case
Yellow Gold 42mm
Dial Color
Beige
Crystal
Sapphire
Water Resistance
30

Current Listings

[WTS] Longines Master Collection Moon Phase Chronograph (40mm) reference L2.673.4.78.6

Longines Master Collection Moon Phase Chronograph (40mm) reference L2.673.4.78.6

Longines - L2.673.4.78.6 · $2,499
A Longines Master Collection Moon Phase Chronograph with a 40mm case, featuring complications including hours, minutes, small seconds, date, moon phase display and chronograph functions.

  • Condition: Excellent used condition
  • Case size: 40mm diameter
  • Thickness: 14.3mm
  • Lugu length: 46.7mm
Posted at
Feb 19, 2026, 8:07 PM
Active
View listing on r/WatchExchange
Longines Master Collection Mens Automatic Watch - L2.628.5 - 38mm - USED [WTS]

Longines Master Collection Mens Automatic Watch - L2.628.5 - 38mm - USED

Longines - L2.628.5 · $999
The Longines Master Collection is a high-end watch featuring an automatic movement, suitable for formal occasions.

  • Condition: USED
Posted at
Feb 17, 2026, 9:58 PM
Active
View listing on r/WatchExchange
[WTS] Longines Avigation w/ Master collection bracelet and OEM leather (Lowest price in the world)

Longines Avigation w/ Master collection bracelet and OEM leather (Lowest price in the world)

Longines - L2.629.4 · $1,200
A Longines Avigation Chronograph with a 40mm black dial, running strong and keeping great time.

  • Condition: Lightly used
  • Bracelet type: Master collection steel bracelet
  • Strap type: OEM leather strap
  • Wrist size compatibility: up to an 8+ inch wrist
Posted at
Feb 15, 2026, 12:59 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection Moonphase 42mm – 2023-2024 movement L899.5 $1500

Longines Master Collection Moonphase 42mm – 2023-2024 movement L899.5 $1500

Longines - L2.919.4.78.3 · $1,500
A Longines Master Collection Moonphase watch in excellent condition, featuring a 42mm stainless steel case, silver barleycorn dial, and automatic L899.5 movement.

  • Condition: Excellent condition
  • Case size: 42mm diameter
  • Movement caliber: L899.5
  • Power reserve: ~72-hour power reserve
Posted at
Feb 11, 2026, 1:31 PM
Active
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[WTS] Longines Master Collection Chronograph Moonphase L2.673.4.61.2 – $2,850 shipped

Longines Master Collection Chronograph Moonphase L2.673.4.61.2 – $2,850 shipped

Longines - L2.673.4.61.2 · $2,850
This Longines Master Collection Chronograph Moonphase features a chronograph function and moon phase display. The watch is in excellent condition with very minor signs of wear.

  • Condition: Excellent overall condition, lightly worn
  • Case wear: very minor signs
  • Crystal condition: flawless
  • Dial condition: flawless
Posted at
Feb 8, 2026, 1:09 PM
Active
View listing on r/WatchExchange
[WTS] Longines Master Collection Moonphase Chronograph L2.673.4.78.3

Longines Master Collection Moonphase Chronograph L2.673.4.78.3

Longines - L2.673.4.78.3 · $2,050
This Longines Master Collection Moonphase Chronograph features an array of complications, a 40mm size, automatic movement, and original strap.

  • Condition: fair to good pre-owned condition
  • Size: 40mm diameter
  • Movement: Automatic movement
Posted at
Feb 8, 2026, 10:03 AM
Active
View listing on r/WatchExchange