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Timing is everything when you're coordinating lifesaving missions, and we're proud to celebrate 10 years as the official watch partner of Air Zermatt. True sky heroes, these skilled helicopter pilots rely on precision timepieces like our Khaki Aviation Converter Auto Chrono as they navigate extreme weather conditions in the Swiss Alps. This special edition pays tribute to their dedication and bravery, and features the Air Zermatt logo stamped onto the case back and special packaging inspired by the Emergency Locator Transmitter boxes carried on every rescue helicopter.
ReferenceH76706730
CaliberH-21-Si
CollectionKhaki Aviation
MovementAutomatic
Watch FunctionChronograph, Date, Day, Tachymeter
Case size44mm
Thickness (mm)14.6
Dial colorBlack
Case materialStainless steel
CrystalSapphire
Lug width22mm
Power reserve60 hour
StatusPast collection
Water Resistance10 bar (100m)/145 psi (328ft)
Anti ReflectionYes
Screw Down CrownYes
Silicon Balance SpringYes
Strap referenceH6007671091
Strap typeCalf leather
Buckle typeH-Buckle
Buckle width22mm
H-21-Si
The H-21-Si is an automatic chronograph movement featuring a state-of-the-art balance spring made from the anti-magnetic material silicon for enhanced resistance to extreme atmospheric conditions. With an extended 60-hour power reserve, this powerful caliber reliably keeps and measures time via two or three sub dials at 6, 9 and/or 12 o’clock, and start/stop and reset pushers on the side.
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Features
SELF-WINDING
Wrist movements cause the inner rotor to swing, transferring energy to the mainspring, and powering your timepiece.
STAINLESS STEEL CASE
A highly resistant alloy composed of steel and chromium. It can be worked to resemble a precious metal. It is nearly impervious to rust, tarnish, and corrosion.
Sapphire Crystal
Synthetic sapphire crystal is a tough scratch-resistant material, only diamonds could leave a mark.
SILICON BALANCE SPRING
Silicon balance springs offer various advantages: immune to magnetic fields, temperature fluctuations, oxidation, aging, shocks, and maintains shape stability.
H-21-Si CALIBER
A powerful automatic chronograph movement featuring an extended 60-hour power reserve. Equipped a state-of-the-art balance spring made from the anti-magnetic material silicon.
WATER RESISTANCE
Your timepiece is resistant up to 10 bar (100m) / 145 psi (328 ft).
KHAKI AVIATION
The Khaki Aviation collection perfectly displays Hamilton's technical know-how when it comes to creating reliable watches for pilots and urban aviators.
3.7/5
Overall rating | 3 reviews
The watch delivery was timely, but nearly three weeks later, I am still waiting for the complimentary luggage trolley.
anonymous a.
July 12, 2021
I like the design of the watch and that the watch has a working circular slide rule.
