Longines - Master Collection - No reserve price - L2.673.4 - Men - 2010-2020

# Longines Master Collection L2.673.4 – 40 mm – Automatic Moonphase Chronograph – Complete Calendar – Silver Guilloché Dial – Caliber L678.2 – Alligator Leather Strap

A particularly elegant Longines Master Collection model with reference L2.673.4, housed in a 40 mm stainless steel case. This automatic watch blends a classic look with an impressive number of complications, including a chronograph, complete calendar, moon phase, 24-hour display, and date indication.

The silver-toned dial with a refined guilloché pattern, black Arabic numerals, and blued hands gives the watch its distinctive classic appearance. The brown Longines alligator leather strap and the signed folding clasp complete the package.

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## Basic Information

Brand: Longines
Collection: Master Collection
Reference: L2.673.4
Type: Automatic menwear
Case diameter: 40 mm
Case material: Stainless steel
Case color: Silver-toned
Dial: Silver-toned with guilloché texture
Hour marks: Black Arabic numerals
Hands: Blued steel
Glass: Sapphire crystal
Movement: Longines caliber L678.2
Winding: Automatic
Frequency: 28,800 vibrations per hour
Power reserve: About 46–48 hours
Functions: Hours, minutes, small seconds, chronograph, day, date, month, moon phase and 24-hour display
Case back: Transparent case back showing the movement
Strap: Brown Longines alligator leather
Clasp: Longines-signed deployant clasp
Estimated production year: About 2010

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## Important Details

- Sought-after Longines Master Collection with extended calendar complications.
- Classic 40 mm stainless steel case.
- Silver dial with fine guilloché pattern.
- Black Arabic hour numerals and elegant blued hands.
- Automatic Longines caliber L678.2.
- Chronograph with central chronograph hand and 30-minute counter.
- Day and month display at 12 o'clock.
- Date indication with central hand and date ring.
- Moon phase and small seconds at 6 o'clock.
- 24-hour indicator at 9 o'clock.
- Transparent case back with decorated movement.
- Brown Longines alligator leather strap with signed deployant clasp.
- Excellent readings on the timegrapher: +3 seconds per day and an amplitude of 311°.

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## Estimated Year of Manufacture

The watch is estimated to be from around the 2010s.

The Longines Master Collection is known for its classic styling and mechanical complications. This edition with a chronograph and complete calendar belongs to the more expansive models within the collection.
An exact production year has not been established.

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## Case

The round case is made of stainless steel and has a diameter of 40 mm.

The polished finish provides an elegant appearance. The case features a smoothly rounded bezel, nicely shaped lugs, and a classic profile that harmonizes with the extensive dial.

On the right side are the crown and two chronograph pushers. In addition, recessed pushers exist for adjusting the calendar functions.

The case is in a neat used condition, with light signs of wear appropriate to the age of the watch.

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## Dial

The silver dial is one of the most striking features of this model.

The central portion features a refined guilloché texture. The black Arabic numerals give the dial a classic look and, together with the blued hands, create a nice contrast.

The various complications are clearly laid out:

At 12 o'clock:
- Day display.
- Month display.
- 30-minute chronograph counter.

At 9 o'clock:
- 24-hour indicator.

At 6 o'clock:
- Small second.
- Moon phase display with starry sky.

Around the outer edge:
- Date scale from 1 to 31.
- Date indication via a central hand with a crescent tip.
- Fine minute scale.

The combination of the guilloché pattern, the multiple sub-dials, and the blued hands gives the watch a rich yet balanced appearance.

The dial is in good condition.

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## Movement

The watch is equipped with the automatic Longines caliber L678.2.

This Swiss mechanical movement is based on the ETA/Valjoux 7751 architecture and is known for its combination of chronograph functions and extensive calendar display.

The movement features automatic winding and a frequency of 28,800 vph, i.e., 4 Hz.

Visible through the display case back, the movement includes the decorated rotor with Longines signature and the caliber designation L678.2.

The finish includes decorative patterns on the rotor and visible mechanical components that contribute to the character of this watch.

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## Case Back

The case back is transparent, revealing the automatic movement.

Around the crystal are the Longines engravings and indications, including the collection name and the stainless steel mention.
The rotor is marked with the Longines name and the designation L678.2.
The rear shows typical light signs of use.

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## Crown and Operation

The ridged crown bears the Longines logo.
The two pushers on the right are used to operate the chronograph.
The calendar functions can be adjusted via the designated setting mechanisms. For a watch with these complications, it is important not to correct the calendar during the rollover period around midnight.

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## Alligator Leather Strap and Clasp

The watch comes with a brown leather strap with crocodile pattern.
The inner side bears the Longines signature and the designation ‘UPSIDE ALLIGATOR LEATHER’, matching a Longines alligator leather strap.
The strap is paired with a stainless steel Longines deployant clasp, featuring the brand logo and the winged hourglass emblem.
The strap shows clear signs of wear, including discoloration, creases, dark spots, and wear around the holes and edges. This is a notable point for the watch’s condition.
The deployant clasp shows light signs of wear and is still well presented.
The strap fits a wrist circumference of up to about 20–21 cm, depending on the desired fit.

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## Water Resistance

This model typically has a water resistance of 3 bar (30 meters) from the factory.
Because this is a used mechanical watch and no recent pressure test is reported, water resistance is not guaranteed. Contact with water is not recommended until the watch has been re-tested for water resistance.

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## Timegrapher – Rate Measurement

The automatic movement was measured with a Weishi No. 1900 timegrapher.
The readings are:
- Rate deviation: +3 seconds per day
- Amplitude: 311°
- Beat error: 0.1 ms
- Frequency: 28,800 vph
- Lift angle set: 52°

These values are very neat for a mechanical watch.
The small rate deviation of +3 seconds per day and the high amplitude of 311° provide a positive impression of performance during measurement. The beat error of 0.1 ms is notably low.
The measurements pertain to a single measurement position. Daily accuracy can vary with wear, winding level, and position of the watch.

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## Condition

Case: Clean used condition with light superficial signs of wear.
Bezel: Polished and well-kept, with minor light marks.
Crystal: Clean, clear appearance.
Dial: Well-kept, with legible numerals and complications.
Hands: Fine blued finish.
Crown and pushers: Maintained external condition.
Case back: Clean used condition with light signs of wear.
Movement: Visually well-maintained with decorated Longines rotor.
Leather strap: Clearly worn, with visible wear and discoloration.
Deployant clasp: Longines-signed, with light signs of use.
Timekeeping: +3 seconds per day, amplitude 311° and beat error 0.1 ms.

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## Overall Condition

A particularly stylish and technically extensive Longines Master Collection L2.673.4 in a classic 40 mm case.

The combination of the silver guilloché dial, blued hands, full calendar, chronograph, and moon phase makes this model attractive to fans of traditional Swiss watchmaking.
The case and dial present themselves in well-kept condition. The brown Longines alligator leather strap is clearly used and shows visible signs of wear. The automatic caliber L678.2 performs with a measured deviation of +3 seconds per day, an amplitude of 311°, and a beat error of 0.1 ms, all very neat values.

An elegant and versatile Longines piece with a rich set of mechanical complications and a timeless appearance.