A stainless steel duo dial reversible wristwatch, Jaeger-LeCoultre, 'Night and Day', circa 2000

nickel lever movement, mono-metallic balance, First dial: silvered, engine turned centre, arabic numerals, blued steel hands, subsidiary seconds; Second dial: black engine turned, applied faceted triangular and luminous arabic numerals, luminous hands, subsidary 24-hour indicator hand; inner case with ribbed upper and lower edges, adjuster in the band for independently setting second time zone, case, dial and movement signed