Military Diver watch "Helium Safe" 24h GMTModel No. T0139
Made by Aeromatic 1912 - Frankfurt/Germany
Limited Edition
The helium valve
The helium valve is especially interesting for occupation divers, who are held also in air environment on pressure. Helium atoms are so small that they can penetrate through sealings into the clock and can construct an interior pressure. This is not tragical at all - if all helium atoms could leave the watch in outside pressure reduction quickly enough. For this circumstance we have added this special valve, which lets the helium-atoms again outward, otherwise it would come to an explosion of the clock!
Dial- Professional helium valve at 9 o'clock (in order to be able to lead during external pressure reduction (e.g. emerging) the accumulating helium fast enough from the clock)
- Date at 3 o'clock
- Central second hand
- Adjustable 60 min. diver-bezel, only anti clockwise
- Lumious hands and indexes
- Color: black
- Bezel color: green
Movement
- High quality "SWISS Ronda Cal.515-24H" quartz movement
- Hacking mechanism (Second hands stops when adjusting the time)
- Second hand ticks
Strap
- High quality stainless steel strap with protecting clasp
- Length 220mm
- Width 22mm
- Color: silver
Case
- Dial width 30mm
- Case size 40.3mm
- Pin to pin (Strap) 44.5mm
- Lug to lug 48.5mm
- Thickness 13.8mm
- Crown diameter 7mm
- All stainless steel
- 60 ATM (2.000ft. / 620m) water resistant
- Mineral glass
- Screwed bottom
- Weight: 158gr / 5.55oz.
- Color: silver
- Delivery with certificate
- 24 month german guarantee
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