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How it felt to be an early aviator, a pioneering pilot flying an airplane at the turn of the twentieth century is something that can’t be recreated, but Hamilton can give you the look - created using modern materials including stainless steel and sapphire crystal. Add an automatic movement and a perfectly proportioned 42mm case for a new take on a vintage timepiece
ReferenceH64645531
CaliberH-40
CollectionKhaki Aviation
MovementAutomatic
Watch FunctionDate, Day
Case size42mm
Thickness (mm)12.15
Dial colorBlack
Case materialStainless steel
CrystalSapphire
Lug width20mm
Power reserve80 hour
StatusPast collection
Water Resistance10 bar (100m)/145 psi (328ft)
Anti ReflectionYes
Open Case BackYes
Strap referenceH6006461111
Strap typeCow leather
Buckle typeH-Buckle
Buckle width20mm
H-40
With an extended power reserve of up to 80 hours, the H-40 is both beautiful and bold. Almost double than market standard, 80 hours power reserve means you can remove your watch on Friday and it will still be ticking on Monday.
Free Next-Day shipping on watch orders until Dec 24. Subject to shipping policy
Complimentary gift box available at checkout (excludes watches with specialty boxes)
We offer free delivery for all orders. If you would like your order to arrive sooner you can select “Next-Day Delivery” (rates vary by location). To find out more information about our delivery options please visit our Shipping Policy.
Return
We offer returns within 14 days from delivery. For more information, please visit our Return Policy.
If you have an item that you would like to return, please contact our customer service department at 1-800-234-8463 or Write us.
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.
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.
5/5
Overall rating | 2 reviews
It’s an absolutely beautiful watch for the price. I’ve bought several Hamilton watches now, it’s a watch that will look great and last forever, but not cost so much you won’t want to wear it every day.
Tim S.
March 17, 2025
I love this watch! It's a perfect size on an average to smaller sized wrist and matches with just about anything. I love the complications this watch has to offer while not being overwhelming to look at. I'm constantly looking at this watch! Truly a fantastic choice as an everyday watch. Lighter on the wrist and the case isn't too thick either. Luminous hands and ticks is a nice bonus! The triangle window on the hour hand is also a nice touch, though it isn't 100% centered, so the number is slightly cut off. The hands themselves are beautiful and the watch looks amazing under the light!
