Diver Master 60ATM WR ( 1968 feet) made by Tauchmeister 1937 Germany

Technical data:

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
Date at 3:00
central second hand
adjustable 24h 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)
delivery incl. Certificate
24 month 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!