Jaeger-LeCoultre Master Compressor Chronograph Q1758170, Reference 175.81.70 or 1758170, Stainless Steel on a Stainless Steel Bracelet, Automatic Movement, Chronograph, 30 minute sub-dial, Hour sub-dial at 9 O'clock, Date and Small Seconds at 6 O'clock, Black Dial with Luminescent Hands and Hour Indicators, Size 41.5 mm, Thickness 14mm, Sapphire Crystal, Water Resistant to 10 atm, Excellent condition but no box or papers.