Professional helium valve on 9:00, in order to be able to lead during external pressure
reduction (e.g. emerging) the accumulating helium fast enough from the clock
central second indicator
Date indicator at 3:00 (quick winding with the crown at Pos. 1 clockwise rotation)
Retrograde 2nd time Zone (GMT-indicator) at 7:00(adjustable with the crown at the 1 position)
high quality precision movement Cal. GP01
professional one side rotating bezel system
casesize 40.3mm; thick 13.8mm; all stainless steel
screwed crown; diameter 7mm (25.4mm is 1 inch)
60ATM (1968 feet) water resistant
hardened mineral glas with DATE-Lens
screwed bottom
illumious hands and indexes
high quality Stainless steel strap with protecting clasp (max. circumference 220mm)
delivery incl. Certificate
24 months warranty

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!