The Basics

The Jaeger-LeCoultre Geophysic® True Second is a round watch introduced in 2015 with simple lines housing the latest-generation automatic calibre: Calibre 770. This calibre is equipped with the new Gyrolab® balance and the “true seconds“ complication. Reference 8018420 has a stainless steel case and a silver dial.

Brand: Jaeger-LeCoultre
Family: Geophysic
Reference: 8018420 (aka: Q8018420)
Name: Geophysic True Second Stainless Steel / Silver
Produced: 9/30/2015
Limited: No

Below is a detailed look at Jaeger-LeCoultre’s model 8018420 from Geophysic watch family, including the price, case details and movement features.

Jaeger-LeCoultre Geophysic 8018420

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The Details

Jaeger-LeCoultre’s Geophysic True Second Stainless Steel / Silver (8018420 (aka: Q8018420)) was originally released in 9/30/2015. This watch features a automatic movement beating at a frequency of 28800 bph ( 4 Hz) to provide a 40-hour power reserve when fully wound.

The Case

The stainless steel case measures 39.6mm in diameter and roughly 11.8mm thick. The round case is paired with a silver color dial with baton-shaped hands, and a stick / dot hour markers and minute track, covered by a sapphire glass. Jaeger-LeCoultre’s Geophysic model 8018420 is water resistant up to 50 meters (164 ft). A display caseback is over the back of the watch case.

Material: Stainless steel
Glass: Sapphire
Back: Display
Shape: Round
Diameter: 39.6mm
Height: 11.8mm
Lug Width: N/Amm
W/R: 50

Case Diameter

Case Thickness

Lug Width

Water Resistance

The Movement

The Geophysic 8018420 movement is a powered by caliber 770 made by Jaeger-LeCoultre. The 36-jewel automatic movement is mm in diameter. Its balance wheel oscillates at 28,800 semi-oscillations per hour or 4 Hz. This movement offers a 40-hour power reserve.

Type: Automatic
Brand: Jaeger-LeCoultre
Caliber: 770
Base: N/A
Display: Analog
Diameter: mm
Jewels: 36
Reserve: 40 hours
Frequency: 28800 bph
Time: Hours, Jumping Seconds

The Price

How much does the Jaeger-LeCoultre’s Geophysic 8018420 cost? This watch was introduced in 9/30/2015 and has been in Jaeger-LeCoultre’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.

CURRENT PRICE: Not Available

For more information, visit Jaeger-LeCoultre online.


  • Brand: Jaeger-LeCoultre
  • Model: Geophysic True Second Stainless Steel / Silver
  • Reference Number: 8018420 (aka: Q8018420)
  • Limited: No

Case & Dial:

  • Material: Stainless steel
  • Glass: Sapphire
  • Back: Display
  • Diameter: 39.6
  • Thickness: 11.8
  • Lug Width: N/A
  • Dial Color: Silver
  • Indexes: Stick / Dot and Baton-shaped hands
  • Water Resistance: 50 meters


  • Winding: Automatic
  • Brand: Jaeger-LeCoultre
  • Caliber: 770
  • Display: Analog
  • Diameter: mm
  • Jewels: 36
  • Power Reserve: 40 hours
  • Frequency: 28800 bph
  • Functions: Hours, Jumping Seconds

About Jaeger-LeCoultre

Jaeger-LeCoultre logo

Antoine LeCoultre established his watchmaking workshop in 1833. LeCoultre was a horological inventor, having developed the pinion cutting machine, and a measuring device accurate to one micron. In 1903, a watchmaker named Edmond Jaeger challenged the Swiss manufactures to mass-produce an ultra-thin movement that he had invented. LeCoultre accepted and completed the challenge. This led to a partnership between the two watchmakers, laying the foundation for the company known today as Jaeger-LeCoultre. Jaeger-LeCoultre is part of the Richemont group.

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