Longines Master Collection Master Collection 40 Moonphase Stainless Steel / Black-Roman / Bracelet

Reference L2.909.4.51.6

Longines Master Collection 40 Moonphase Stainless Steel / Black-Roman / Bracelet

About this watch

The Longines Master Collection 40 Moonphase, model L2.909.4.51.6, is a masterpiece of luxury watchmaking. This elegant timepiece boasts a classic design with a black guilloché dial adorned with Roman numerals, exuding timeless appeal. The round stainless steel case (40mm diameter) and sleek design make it versatile for various occasions. At its heart beats the self-winding Longines caliber L899.2 movement, featuring a moon phase indicator and date function. This automatic movement is based on the reliable ETA A31.L91, with a frequency of 25,200 vibrations per hour and a power reserve of 64 hours. The watch's durability is ensured by its stainless steel case, resistant to corrosion and scratching. Protected by sapphire crystal, the stunning guilloché dial remains vibrant and clear. The comfortable stainless steel bracelet features a deployment clasp, adding an extra layer of sophistication. With a water resistance rating of 30 meters, this watch is suitable for light splashes but not designed for aquatic adventures. The Longines Master Collection 40 Moonphase is an investment in style and craftsmanship, available at authorized retailers or luxury boutiques.

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Key Features

Black guilloché dial with Roman numerals
Self-winding Longines caliber L899.2 movement
Moon phase indicator and date function
Stainless steel case (40mm diameter)
Sapphire crystal protection
Comfortable stainless steel bracelet with deployment clasp
30 meters water resistance

Specifications

Brand

Longines

Family

Master Collection

Model

Master Collection 40 Moonphase Stainless Steel / Black-Roman / Bracelet

Reference

L2.909.4.51.6

Movement

l899-2

Movement Features

Hours, Minutes, Small Seconds
Date
Moonphase

Case

Stainless Steel 40mm

Dial Color

Black

Crystal

Sapphire

Water Resistance

Current Listings

Longines Master Collection Small Seconds L2.843.4.63.2

Longines - L2.843.4.63.2 · $1,500

This Longines Master Collection Small Seconds features a sleek design and comes with an unused leather strap.

Condition: no noticeable flaws
Strap material: leather
Shipping location: CONUS (continental US)
Shipping method: USPS

Posted at

Feb 28, 2026, 1:41 PM

Active

View listing on r/WatchExchange

Longines Master Collection Small Seconds L2.843.4.63.2

Longines - L2.843.4.63.2 · $1,500

The Longines Master Collection Small Seconds is a luxury watch featuring small seconds functionality.

Condition: no noticeable flaws
Straps Included: true

Posted at

Feb 21, 2026, 2:35 PM

Active

View listing on r/WatchExchange

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