Case Construction


SAS watches are built to be tough and durable, and on this page we will show you how we designed our Divers case to keep up with the demands of the professional diver.







From the drawing board to your wrist, we take great care of every detail no matter how small to ensure the watch design is a whole package. We have angled the case so we could shorten the lugs to make it more comfortable. The lugs are also very thick making them strong enough to take on the hardest knocks. We have also used solid bars to hold the straps secured with Allen key heads on either end. We prefer using the Allen key design because it is less likely for the screwdriver to slip when changing straps, therefore reducing the risk of scratching the lugs.







Case construction


Our divers watch is rated to a depth of 1000 Meters. This is far beyond any depth a human body can reach so no matter what depth you are diving to, your SAS watch will be nowhere near its limits. We have achieved this by a crystal that is 4.35mm thick, twin seals on the caseback and triple seals on the crown.









The crown is a screw down type with triple seals, and instead of giving it large crown guards we have recessed the case to take part of the crown offering it protection. We didn't want a large crown that would get in the way and be uncomfortable on the wrist, and we didn't want one too small that it would be hard to use, so getting the size just right was very important. The divers watch comes complete with our submarine SEA logo.









The next two features are mainly aimed at professional saturation divers, the HEV and the screwed down crystal.


First you will see a cut away picture of the helium escape valve (HEV) this is a small device on the side of the case the releases helium pressure during decompression. Helium can penetrate the case during the long periods of time in the pressure chamber. During decompression, the Helium cannot escape fast enough and results in a higher pressure inside the watch. This pressure inside the watch can cause the crystal to become loose or in some cases completely pop off. The HEV releases any pressure building up inside the case.






Secondly we have added a securing ring around the crystal. This securing ring holds the crystal in place so even if the HEV fails to release the pressure, the crystal will remain in place.









Divers Bezel,


When we designed our diver’s bezel we had durability and legibility in mind. It needed to be tough to take knocks but also it had to remain legible no matter how much abuse it had received to perform its primary function, and that is to time dive lengths.

We start with a blank bezel and we deep etched out the areas around the numbers, we then PVD this part black so that the numbers and other markings really stand out. The PVD is protected by the higher areas from any rubbing from sleeves or any accidental knocks it might encounter.







Anti Magnetic

A good diver’s watch is not only worn by divers but by people who need tough watches for any purpose. One of the main enemies of an automatic movement is magnetism. If a movement gets magnetised it will not run correctly, and will either speed up or slow down. To combat this we have surrounded the movement with a soft iron shield. This soft iron shield eliminates the magnetising effect on the movement and takes the watch from a normal rating of 4,800 A/M up to 80,000 amperes per meter.