MWC Swiss Made 500m (1640ft) Water Resistant Automatic Divers Watch in Black PVD Stainless Steel With Sapphire Crystal, Ceramic Bezel and Helium Valve - Ex Display Watch Reduced
This watch is brand new but was one of 2 watches used on the stand at the EPHJ-EPMT-SMT watch and jewelry show in Geneva and the IFSEC International 2022 show in the UK. The watch is fully guaranteed for two years and in perfect condition though the packaging may show some blemishes and the strap may show some signs of having been tried on a few times. The watch is a bargain because it is substantially reduced and we only have this one at the reduced price.
SKU Code: CH/500M/PVD/SIL
These MWC 100% Swiss Made 500m water resistant divers watches with helium escape valve are one of MWC's latest elite range, this model also has the advantage of an impact-resistant sapphire crystal and a scratch-resistant ceramic bezel. These watches are deal for all applications from an office environment to challenging outdoor activities.
The movement is a high quality 25 jewel Swiss Ronda R150 automatic with hacking function to enable synchronisation. The movement also has a 40-hour power reserve.
The special covert matt black non reflective PVD finish used for this watch is often specified in procurement contracts which we fulfill for a wide range of organisations. In the PVD process the steel is not black all the way through because the color is created by a special chemical PVD plating process which is vastly superior to the painted finish used on many lower quality watches, unlike paint which can easily fade or rub off. this does not happen with PVD The PVD process means that the color of the steel is altered at a molecular level, therefore it will not deteriorate even during heavy usage although it can be destroyed if the case is badly damaged by a piece of metal being gouged out or if the case is worn down by really heavy abrasion against rocks or something similar.
All MWC 500M models are fitted with a helium escape valve, people often ask us how helium gets into a dive watch in the first place and the answer is very simple, essentially a helium molecule is among the smallest of all molecules. What this means is because they are so small even though the seals are working fine to keep water out the helium molecules can still get through and enter the watch even though other gases and water cannot.
The main users professionally of watches with helium escape valves are saturation divers who spend long periods of time at great depth with high pressure, the result is that the helium molecules can build up inside the watch creating pressure inside the case, this can inflict serious damage to the watch and even blow out the crystal or crown when it’s unscrewed, this is potentially extremely dangerous if for example you are just checking or resetting the time, it can also potentially write off the watch. What the helium escape valve does is automatically allow the helium molecules to escape from the watch during decompression when the watch returns to normal standard sea level pressure. The valve is only one way so it lets the helium out but prevents anything external getting in.
For anyone who does not know why the helium is an issue, it’s important to understand why helium is employed for deep diving. The reason is that helium is one of very few gasses which does not have negative effects such as we see with nitrogen which causes nitrogen narcosis, consequently helium is used to replace nitrogen in most deep-sea mixed gas diving applications.
In some situations, professional divers can operate at great depth for extended periods where they live in dry environments pressurised with an oxygen/helium mix. When the divers surface and decompress after days or even sometimes weeks this gas must be removed to prevent problem as mentioned earlier such as the crystal or crown being blown out which can potentially injure or even blind someone.
The reality is that most divers will not be living in a pressurized environment for days or weeks on end, this means they will have no need for a watch equipped with a helium valve, regardless of how deep they dive but with deep diver watches such as our 500M range, it's essential the valve is there just in case it’s needed because the watch would not be fit for purpose without it.
Dimensions and Specification:
- Movement: 25 Jewel Swiss RONDA R150 Automatic with hacking function
- Water Resistance: 500 m / 1640ft
- Helium Escape Valve
- Crown: Screw Down Locking
- Width 44mm
- Thickness: 13.4 mm
- Crystal Type: Shatter and Scratch Resistant Sapphire with Anti-Reflective Coating.*
- Lug to Lug: 52 mm
- Case: 316L Black PVD Steel
- 120 click unidirectional bezel with ceramic insert
- Illumination: Swiss Super Luminova on markers and hands
- Strap: 22mm Silicon/Rubber