The Basics

Fitted with Longines caliber L636, the Master Collection Day-Date displays both day and date through a window at 3 o’clock. It is available in a number of variations; ref. L2.755.4.78.3 has a stainless steel case and a silver dial.

Brand: Longines
Family: Master Collection
Reference: L2.755.4.78.3 (aka: L27554783)
Name: Master Collection Day Date
Produced: N/A
Limited: No

Below is a detailed look at Longines’s model L2.755.4.78.3 from Master Collection watch family, including the price, case details and movement features.

Longines Master Collection L2.755.4.78.3

The Details

Longines’s Master Collection Day Date (L2.755.4.78.3 (aka: L27554783)) was originally released in N/A. This watch features a automatic movement beating at a frequency of 28800 bph ( 4 Hz) to provide a 38-hour power reserve when fully wound.

The Case

The stainless steel case measures 38.5mm in diameter and roughly mm thick, with 20mm lug width. The round case is paired with a silver color dial with feuille-shaped hands, and a arabic numerals hour markers and minute track, covered by a sapphire glass. Longines’s Master Collection model L2.755.4.78.3 is water resistant up to 30 meters (98 ft). A display caseback is over the back of the watch case.

Material: Stainless steel
Glass: Sapphire
Back: Display
Shape: Round
Diameter: 38.5mm
Height: mm
Lug Width: 20mm
W/R: 30

Case Diameter

Case Thickness

Lug Width

Water Resistance

The Movement

The Master Collection L2.755.4.78.3 movement is a powered by caliber L636 made by Longines. The 25-jewel automatic movement is 25.6mm in diameter. Its balance wheel oscillates at 28,800 semi-oscillations per hour or 4 Hz. This movement offers a 38-hour power reserve.

Type: Automatic
Brand: Longines
Caliber: L636
Base: ETA 2836-2
Display: Analog
Diameter: 25.6mm
Jewels: 25
Reserve: 38 hours
Frequency: 28800 bph
Time: Hours, Minutes, Seconds

The Price

How much does the Longines’s Master Collection L2.755.4.78.3 cost? This watch was introduced in N/A and has been in Longines’s collection for around . This watch is not a limited release. As with most luxury watches, the price of depends on the availability and demand.


For more information, visit Longines online.


  • Brand: Longines
  • Model: Master Collection Day Date
  • Reference Number: L2.755.4.78.3 (aka: L27554783)
  • Limited: No

Case & Dial:

  • Material: Stainless steel
  • Glass: Sapphire
  • Back: Display
  • Diameter: 38.5
  • Thickness:
  • Lug Width: 20
  • Dial Color: Silver
  • Indexes: Arabic Numerals and Feuille-shaped hands
  • Water Resistance: 30 meters


  • Winding: Automatic
  • Brand: Longines
  • Caliber: L636
  • Display: Analog
  • Diameter: 25.6mm
  • Jewels: 25
  • Power Reserve: 38 hours
  • Frequency: 28800 bph
  • Functions: Hours, Minutes, Seconds

About Longines

Longines logo

Augueste Agassiz founded Longines in 1832 in Saint-Imier, Switzerland. Now owned by the Swatch Group, the manufacture is best known for its aviator watches. Its Heritage Collection includes the Telemeter Chronograph, Heritage Retrograde, Column-Wheel Chronograph, and Heritage 1935. Longines is part of the Swatch Group group.

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