Cal. 918 nickel-finished lever movement 22 jewels blue dial luminous Arabic and dagger numerals centre seconds window for date large circular water-resistant-type case crown at 10 oclock to adjust the revolving outer ring calibrated for 60 units crown at 2 oclock to wind and set the alarm indicated on the fan-shaped sector crowns at 2 and 4 oclock each fitted with a compressor system to ensure water-resistance of watch back secured by four screws 18K white gold Jaeger-LeCoultre deployant clasp case dial and movement signed