A field watch has one job: to tell you the time at a glance, anywhere, without fuss. The Hamilton Khaki Field is the watch most people think of when they hear the term. It is simple, tough, and one of the least expensive ways to own a Swiss mechanical watch with real history behind it.
The difficulty is that "Khaki Field" is a family, not a single watch. There are hand-wound and automatic versions, several sizes, and models with their own names. This guide explains each one and helps you choose. We have 137 Khaki Field watches in stock, from $295, among 785 Hamilton watches in all.
By the numbers: Switzerland exported CHF 25.9 billion of watches in 2024, 2.8% less than in 2023, in 15.3 million pieces (9.4% fewer), according to the Federation of the Swiss Watch Industry (swissinfo.ch, 30 January 2025).
Where the Khaki Field comes from
Hamilton was founded in 1892 in Lancaster, Pennsylvania, and made its name with railroad pocket watches. During both World Wars it supplied watches to the United States armed forces, and it went on making military watches for decades afterward.
Those service watches set the pattern: a plain steel case, a black dial with white numerals from 1 to 12, a second ring of numbers from 13 to 24 for military time, and luminous hands. The Khaki Field keeps all of it.
Hamilton today is a Swiss brand. It belongs to the Swatch Group, its watches are made in Switzerland, and its movements come from within the group, which is how it can offer long power reserves at its prices.
The main choice: Mechanical or Auto
Two watches sit at the center of the family. They look alike and feel different.
| Khaki Field Mechanical | Khaki Field Auto | |
|---|---|---|
| Winding | By hand, with the crown | Automatic, by the motion of your wrist |
| Movement | H-50 | H-10 |
| Power reserve | 80 hours | 80 hours |
| Water resistance | 50 meters | 100 meters |
| Date | No | Yes |
| Case back | Closed steel | Glass, showing the movement |
| Sizes | 38 mm and 42 mm | 38 mm and 42 mm |
Khaki Field Mechanical
The Mechanical is the purist's choice and the closest to the watches issued to soldiers in the 1960s. You wind it by turning the crown, about once every three days thanks to its 80-hour reserve. Many owners enjoy the routine.
It has a matte, bead-blasted case that does not reflect light, no date, and at 38 mm a thickness of about 9.5 mm, so it sits flat and slides under a cuff. It is usually sold on a fabric strap, which suits it.
Choose it if you like the idea of winding your watch, want the slimmest and most authentic version, and do not need a date.
Khaki Field Auto
The Auto winds itself as you wear it. It adds a date window, a glass back and twice the water resistance, at 100 meters. The case is a little thicker, about 11 mm in the 38 mm size, and has a brushed and polished finish that is slightly dressier. It is offered on leather or on a steel bracelet.
Choose it if this will be your everyday watch, if you want a date, or if you will wear it around water.
If you are new to the difference between winding by hand and automatic winding, our guide to winding and setting an automatic watch explains both.
38 mm or 42 mm
Both main models come in two sizes.
- 38 mm is the traditional size and the one closest to the originals. It suits most wrists, and it is the size many buyers prefer.
- 42 mm has more presence and is easier to read. It suits larger wrists.
A field watch has a narrow bezel and a dial that reaches almost to the edge of the case, so it looks larger on the wrist than a dive watch of the same diameter. If you are unsure, choose the 38 mm. Our guide to choosing your watch size shows how to measure, and the Real size button on each product page shows the case at its true size.
The family also includes smaller quartz models, down to 33 mm.
The named models
Khaki Field Murph
The Murph is the watch worn by the character Murph in the film Interstellar. Hamilton made it for the film and later added it to the range because so many people asked for it.
It is a Khaki Field Auto at heart, with the H-10 movement, an 80-hour reserve and 100 meters of water resistance, but with its own look: a black dial, cathedral-style hands, and no date. It comes in 42 mm, the size seen in the film, and in 38 mm.
Khaki Field King
The King shows the day of the week spelled out at the top of the dial as well as the date. It is 40 mm and uses the H-40 automatic movement, also with an 80-hour reserve. It suits buyers who want more information on the dial and a slightly dressier watch.
Khaki Field Expedition
Introduced in 2023, the Expedition adds a rotating bezel marked with the points of the compass. It comes in 37 mm and 41 mm, with the H-10 movement and 100 meters of water resistance. It is the most outdoor-minded of the family.
Titanium and special finishes
Some Khaki Field models are made in titanium, which is lighter than steel and darker in color, in bronze, or with a black coating. The case material is stated in the specifications of each watch.
Reading a Hamilton reference
Hamilton references begin with an H followed by eight digits. For the Khaki Field, the first digits tell you the model:
| Reference | Watch |
|---|---|
| H69439931 | Khaki Field Mechanical 38 mm, black dial |
| H70455133 | Khaki Field Auto 38 mm, black dial, steel bracelet |
| H70455533 | Khaki Field Auto 38 mm, black dial, leather strap |
| H70405730 | Khaki Field Murph 38 mm |
| H70605731 | Khaki Field Murph 42 mm |
As a rule, references beginning H69 are hand-wound Mechanical models and those beginning H70 are automatic. The digits near the end change with the dial color and the strap. The reference is shown under the title of every watch on our site; type it into the search box to find the exact version.
Water resistance, in practice
This is the practical difference between the two main models.
- The Mechanical is rated to 50 meters. That covers rain, washing your hands and getting caught in a shower. It is not meant for swimming.
- The Auto, the Murph and the Expedition are rated to 100 meters, which covers swimming.
None of them is a dive watch. If you want a Hamilton for the water, look at the Khaki Navy line. Our guide to water resistance explains what the ratings mean.
Straps
A field watch is made to change straps, and the Khaki Field has ordinary lugs, 20 mm wide on the 38 mm models, so almost any strap fits. Fabric, leather and steel each change its character. A watch delivered on the steel bracelet costs a little more and gives you the most options, because a bracelet is the expensive part to add later.
What to check before you buy
- Mechanical or Auto. Confirm it from the reference and from the Movement row in the specifications. In photographs, a date window means Auto.
- The size. 38 and 42 mm versions have the same name. Check the diameter.
- Strap or bracelet. The photographs show what the watch comes on.
- Condition. Each listing says whether the watch is new, unworn or pre-owned.
- Box and papers. The listing states what is included.
Other Hamilton lines to consider
If the field watch is not quite right, Hamilton makes three related families: the Khaki Aviation pilot's watches, the Khaki Navy dive and marine watches, and the dressier Jazzmaster and American Classic lines. You can browse every Hamilton we stock, or see the Khaki Field watches on their own. If this is your first mechanical watch, our guide to choosing your first luxury watch sets out the alternatives.
Frequently asked questions
What is the difference between the Khaki Field Mechanical and the Khaki Field Auto?
The Mechanical is wound by hand, has no date, a closed case back and 50 meters of water resistance. The Auto winds itself, has a date, a glass case back and 100 meters of water resistance. Both have an 80-hour power reserve.
Can I swim with a Hamilton Khaki Field?
With the Khaki Field Auto, the Murph or the Expedition, yes: they are rated to 100 meters. The Khaki Field Mechanical is rated to 50 meters and is better kept out of the pool.
How often do I need to wind the Khaki Field Mechanical?
It runs for about 80 hours on a full wind, so every two or three days is enough. Many owners wind it each morning out of habit.
Is the Hamilton Murph the watch from Interstellar?
Yes. Hamilton made the watch for the film and later produced it for sale. The 42 mm model is the size seen on screen; a 38 mm version was added afterward.
Is Hamilton an American or a Swiss brand?
Both, in a way. Hamilton was founded in Lancaster, Pennsylvania, in 1892, and its designs draw on that American history. Today its watches are made in Switzerland and the brand belongs to the Swatch Group.
Is Watchflix NYC an official Hamilton retailer?
No. We are an independent retailer and are not affiliated with Hamilton. Every watch is checked by our specialist before it ships.
