Military Industries 1982 Pattern 300m Water Resistant Military Divers Watch With Date Window (Automatic) Ex Display Watch Half Price!
FEINDEF 2023 International Defense Exhibition - as New but has been tried on etc and the packaging is slightly soiled.
SKU Code: SUB/MILSSAU/MY
- 300m / 1000ft Water Resistant
- Screwdown locking crown
- Miyota Self Winding 21 Jewel Movement
- Width Inc Crown 45mm (Exc Crown 41mm)
- Thickness 15mm
- Crystal Diameter 31mm
- Sapphire Crystal*
- Illumination: Super Luminova (but with encircled T for historical accuracy)
- Lug to Lug 49mm
- Weight 89.5g
- 20mm NATO Webbing Strap
* Sapphire crystal is a very hard, transparent material made of crystallized pure aluminium oxide created at very high temperatures. Synthetic sapphire has the same hardness as natural sapphire, the primary difference is that is does not contain the colouring agents that gives actual sapphire it's range of colours. When it is heated, the synthetically manufactured sapphire forms round masses, that are then sliced into pieces with diamond-coated saws. These disks are then ground and polished into the watch crystals used in higher specification watches. (One reason sapphire crystals are relatively expensive is that the tools required to cut and polish this extremely hard material are very costly.) Sapphire (whether natural or synthetic) is one of the hardest substances on earth. It measures 9 on the Mohs scale, which is a system for rating the relative hardness of various materials. (Diamond measures 10, the highest rating.) Watch crystals made of synthetic sapphire are often marketed as “scratch resistant” or “virtually scratchproof” because they are very difficult - but not impossible - to scratch. Diamond can scratch them; so can man-made materials that incorporate silicon carbide, which, with a Mohs rating of between 9 and 10, is harder than sapphire. So, if you accidentally scratch your watch on a simulated-stone surface or a wall that incorporates some of these silicon carbide materials, it could scratch the crystal but a sapphire crystal being scratched or shattered is a very rare event.