A pink gold rectangular reversible wristwatch with power reserve and moon phases, Jaeger-LeCoultre, 'Reverso Night and Day', circa 2000

18k, tonneau nickel lever movement, 33 jewels, mono-metallic compensation balance, adjusted to 5 positions, silvered matte dial, arabic numerals, two fan-form sectors indicating night and day and 40 hour power reserve, subsidiary dial indicating constant seconds combined with phases and ages of the moon, rectangular reversible case, sapphire crystal display back, case, dial and movement signed, with 18k pink gold Jaeger-LeCoultre deployant clasp, accompanied by Jaeger-LeCoultre cardboard slipcase, leather-covered box, instructions, guarantee and certificate.