Modern, it can be called so, as this watch was conform to the norms in that matter ( ISO 6425 ):

- Protection against inadvertent rotation for the bezel. 

- Indication that the watch is running. 

- Water Resistance with a minimum of 100 meters. 

- Antimagnetic resistance, salt water resistance, shock resistance.

- Operating indicator. 

- Visibility in the dark at a distance of 25 cm for the hands and the bezel. 

- Resistance to thermal shocks... Among a few other things. 

The Master Compressor Diving GMT is all of that, with some original solutions. 

First of all, it is a diving watch with a GMT, as you can see at 9 o' clock with a sub dial dedicated to a different time zone on 24 hours. 

Then, you have the hour hand of the local time which can be set by increments one one hour. 

The Date was not necessary, but you have one. Some will like others won't... The eternal discussion. 

More original, not to say unique, an operating indicator, which is this curious blue and white rectangle, located above the 6 hour marker, replacing the traditional second hand.

The dial with its trapezoidal indices and 6 / 12 hours markers, borrows some elements of style / design of the Polaris, obviously.

The bezel is unidirectional, with 120 teeth. The triangle at 12 is filled with super luminova, as well as the indices and hours / minutes hands.

The piece of choice is the way Jaeger Lecoultre found a solution to ensure the watch its water resistance to 1000 meters. 

Here the case back is held by four screws, which can frighten some of us, but the weak point of a diving watch is the crown. 

The Manufacture adopted the compressor crown technology, introduced for the first time in 2002 for the Master Compressor Memovox, a modern evocation of the Polaris. 

The Master Compressor Memovox, here in platinum: 

Rubber-moulded, this crown can be screwed or unscrewed. When the color is white, that means that the joint is compressed ( protected ), while it is blue when it is decompressed. 

This watch is a beast, even if the proportions of its case, in the real life, are less important than on the paper. 

Indeed, with a diameter of 44 mm and a height of 16, 25 mm, it is above the competitors in terms of size. Still it is surprisingly wearable. 

The case is made in titanium Grade 5, which is an alloy of titanium , aluminium and vanadium, this alloy being famous for its higher resistance to scratches, compared to the more common ( at that time ) titanium grade 2. 

The watch was available with three straps, the rubber, the articulated rubber bracelet, and the titanium grade 2 bracelet. The most comfortable were the rubber strap and the articulated rubber bracelet when I tested all of them. 

The articulated rubber bracelet on the " Pro Géographique ":

The movement is the Cal 975D, offering a power reserve of 48 hours, beating at 28, 800 vibrations per hour, and which is automatic, which is always a good thing for a diving watch, as it will allow you to wind the watch much less than with a manual winding movement, thus which will protect the seal between the crown and the case better, even if this watch uses a compressor crown. 

Limited to 1500 pieces, the Master Compressor Diving GMT was an original, dynamic and well made watch. Since its introduction, Jaeger Lecoultre offered an even more technical diving watch with the Master Compressor Diving  Pro Geographique which included a Travel Time and a mechanical Depth Gauge to the GMT and the Date, and a more sensual " Compressor ", with the Navy SEALs Alarm. 

The " Pro Géographique ": 

The " Navy SEALs Alarm ":

Still, the Master Compressor Diving GMT was a precursor for Jaeger Lecoultre and their journey into modern diving watches, which makes it an important, interesting and pleasant watch. 

Looking forward to reading your comments and thoughts, 

Best. 

Nicolas