Jaeger-LeCoultre

A friend is seeking advice regarding the 18 KG chronograph shown below, so I am wondering whether the experts here might have some information. Is this one authentic? Do all elements appear to be original to the watch -- dial, hands, pushers, case, moveme...  

Hi Jeff, Difficult to see if all is correct without better pics, but it looks OK at first glance. It's a Master Mariner 12-hours chronograph from the mid 60's (1965-1966?). The version shown in this scan is the SS version, as you can see it has luminus ha...