Professional Diver U-BOOT Tauchmeister Watch T0138

Professional Diver SWISS-GMT-movt. U-BOOT SUB. 600m HELIUM-SAFE T0138
- Professional helium valve on 9:00 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 3:00
- Central second hand
- Adjustable 60 min. Diver- bezel only anti clockwise
- Casesize 40,3 mm; thick 13,8 mm; all stainless steel
- Screwed Crown; diameter 7 mm (25,4mm is 1 inch)

- 60 atm (1968 feet) water resistant
- High quality SWISS-RONDA Cal. 515.24H movement
- Hardened mineral glas with DATE-Lens
- Screwed bottom
- Illumious hands and indexes
- High quality Stainless steel strap with protecting clasp (max. circumference 220mm)

Comment:

The helium valve is especially for occupation diver interesting, who are held also in air environment on pressure. Helium atoms are so little that they can penetrate through sealings into the clock and can construct an interior pressure. This is further not tragically - if all helium atoms could leave in outside pressure reduction quickly enough the clock. For this case we add this special valve, which lets the helium-atoms again outward, otherwise it would come to an explosion of the clock!