Longines Master Collection Master Collection Power Reserve

Reference L2.666.4.51.6

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.

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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

Current Listings

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

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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

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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

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Longines Avigation automatic Chronograph with OEM leather and Master Collection steel bracelet(price reduction)

Longines - L2.629.4 · $1,250

The Longines Avigation automatic Chronograph features a 40mm black dial with date functionality and chronograph capabilities. It comes with an OEM leather strap and a master collection steel bracelet, making it suitable for both formal and sporty occasions.

Condition: Lightly used
Bracelet price: $400 (Master Collection steel)
Shipping: FedEx 'hold at location'
Accepted payment methods: Zelle, cash app, PayPal F&F and G&S(+4.5%)

Posted at

Feb 6, 2026, 8:02 PM

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

Longines - L2.673.4.78.6 · $2,250

A beautiful Longines Master Collection Moon Phase Chronograph with a 40mm case, featuring hours, minutes, small seconds, date, and chronograph functions.

Condition: Excellent used condition
Case size: 40mm diameter
Thickness: 14.3mm
Power reserve: 66 hour

Posted at

Feb 6, 2026, 12:28 PM

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[WTS] Longines Master Collection Chronograph w/ Custom 1.5 Link for Perfect Sizing! Ref L2.629.4.78.6 - $1,500 Shipped[WTS] Longines Master Collection Chronograph w/ Custom 1.5 Link for Perfect Sizing! Ref L2.629.4.78.6 - $1,500 Shipped

Longines Master Collection Chronograph w/ Custom 1.5 Link for Perfect Sizing! Ref L2.629.4.78.6 - $1,500 Shipped[WTS] Longines Master Collection Chronograph w/ Custom 1.5 Link for Perfect Sizing! Ref L2.629.4.78.6 - $1,500 Shipped

Longines - L2.629.4.78.6 · $1,500

This is an automatic chronograph watch with a classic white dial and a chronograph function, packaged in its original box with papers included.

Condition: Next to new
Bracelet size customization: Custom 1.5 link
Thickness: 11.7mm

Posted at

Feb 5, 2026, 10:22 AM

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Longines Master Collection Moonphase Chronograph 40mm L2.673.4.78.6

Longines - L2.673.4.78.6 · $1,850

This Longines Master Collection Moonphase Chronograph features a 40mm case and includes a column wheel chronograph, 12 hour chronograph, moonphase display, and triple calendar.

Condition: Pre-owned with wear and use, some scratches and scuffs
Authentication: includes Box and Papers with Ebay authentication
Service history: unknown, previous owner claimed serviced before selling
Box condition: slightly damaged with one flap falling off and taped

Posted at

Jan 31, 2026, 4:06 PM

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