Jaeger LeCoultre Q8018420 Geophysic True Second, 8018420, stainless steel case on a leather strap with a steel deployant clasp, Automatic Caliber 770, 40 hour power reserve, "True Second" (dead beat seconds), second hairspring to assist in maintaining power reserve for dead beat seconds, independent hour adjustment, silver dial with fine grain finish, luminous steel hands, lume plots on inner rehaut, sapphire crystal, display back, diameter: 40mm, thickness: 12mm. Excellent condition with original warranty papers only.