watches-for-sale

Retrograde GMT 1000m "Helium Safe" with saphire glass
Model No. T0113

Made by Aeromatic 1912 - Frankfurt/Germany
Limited Edition

Description

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 indicator at position 4 o'clock (quick winding with the crown at Pos.1 in clockwise rotation)
Central second hand
Retrograde (Fly-Back) 2nd time zone (GMT-indicator) at 7 o'clock (adjustable with the crown at Pos.1)
Specially coated luminous hands and digits "night employment suitable"
Professional one side rotating bezel system
Color: black