Jaeger-LeCoultre
Jaeger-LeCoultre Geophysic True Second Q8018420
The Jaeger-LeCoultre Geophysic True Second (reference Q8018420) is a 39.6 mm stainless steel watch with a silver dial. It runs on the automatic caliber 770 with a 40-hour power reserve and is water resistant to 50 m. It was introduced in 2015.
Specifications
Case
- Reference
- Q8018420
- Collection
- Geophysic
- Case size
- 39.6 mm
- Thickness
- 11.8 mm
- Case material
- Stainless steel
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
- Bracelet / strap
- Alligator leather strap
Dial and bezel
- Dial
- Silver
Movement
- Movement
- Automatic
- Caliber
- 770
- Power reserve
- 40 hours
- Frequency
- 28,800 vph
- Functions
- Date, Deadbeat seconds
Production
- Production
- 2015 – today (discontinued)
How it compares within the Geophysic family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| Q8018420 (This watch) | 39.6 mm | Stainless steel | Silver | 770 | 2015– |
| Q8002520 | — | Pink gold | — | — | — |
| Q800652J | — | Platinum | — | — | — |
| Q8008520 | — | Stainless steel | — | — | 2014– |
| Q8018120 | — | Stainless steel | Silver | — | — |
| Q8018480 | 39.6 mm | Stainless steel | Blue | 770 | 2015– |
| Q8102520 | — | Pink gold | — | — | — |
| Q8108420 | — | Stainless steel | — | — | 2015– |
| Q8126420 | — | — | — | — | — |
About the Geophysic family
The original Geophysic Chronometer was introduced in 1958 for the International Geophysical Year, with an anti-magnetic, shock-resistant case. Jaeger-LeCoultre reissued it in 2014 as the Geophysic 1958.
In 2015 the brand added the Geophysic True Second, whose caliber 770 makes the seconds hand jump in whole seconds, and the Geophysic Universal Time with a world-time display. The catalog lists stainless steel, pink gold and platinum references. Dealers identify the model and metal and check the strap and papers.
Quick answers
- What size is the Jaeger-LeCoultre Geophysic True Second Q8018420?
- The Jaeger-LeCoultre Geophysic True Second Q8018420 has a 39.6 mm case, 11.8 mm thick.
- What movement does the Jaeger-LeCoultre Geophysic True Second Q8018420 use?
- It uses the automatic caliber 770, with a 40-hour power reserve.
- How water resistant is the Jaeger-LeCoultre Geophysic True Second Q8018420?
- It is water resistant to 50 metres.
- Is the Jaeger-LeCoultre Geophysic True Second Q8018420 still in production?
- Discontinued.
- When did the Jaeger-LeCoultre Geophysic True Second Q8018420 come out?
- It was introduced in 2015.
- What is the Jaeger-LeCoultre Geophysic True Second Q8018420 made of?
- The case is stainless steel. Bracelet or strap: Alligator leather strap.
Catalog facts checked September 2026.