The Jaeger-LeCoultre Master Compressor Diver collection was introduced at SIHH 2007, featuring three over-sized limited edition dive watches.The case of the Chronograph measures 44mm across, holding the self-winding caliber 751D. Reference 186T670 is fitted with a rubber strap; it was also available in other configurations.- Articulated rubber and diving strap: Q186T770 - Moulded rubber and diving strap: Q186T670 - Titanium bracelet and diving strap Q186T170