Imagen: Hamilton, web oficial
The storyWhy this reference matters
In Interstellar (2014), Cooper leaves his watch with his daughter Murph before he goes. From inside the tesseract, in the fifth dimension, he sends her the data that saves humanity by twitching the seconds hand in morse. When Murph cracks the formula, she shouts Eureka. Hamilton did more than lend a watch: it worked with Christopher Nolan and production designer Nathan Crowley to build the thing, a prop assembled for the film rather than a catalogue product.
There was no plan to sell it. The watch existed because the script needed it, and that was that. Five years of people asking after it in shops and on forums changed Hamilton's mind: the production Khaki Field Murph landed in 2019 at 42 mm. The private joke that finishes it off is the word Eureka, lacquered onto the seconds hand in morse, so small that the brand itself warns you'll need a watchmaker's loupe to read it.
A more wearable 38 mm followed, along with several dial variants, but the morse wink belongs to the original 42: Gear Patrol notes that only the 42 mm carries that detail on the seconds hand. So the little brother is the comfortable one and the big brother is the one that tells the whole story. Choosing between them isn't a size decision, it's a choice between your wrist and the anecdote.
SpecificationsThe numbers, in one table
| Brand | Hamilton |
|---|---|
| Family | Khaki Field |
| Reference | H70605731 |
| Years made | desde 2019 |
| Calibre | Hamilton H-10 |
| Movement | Automatico |
| Frequency | 21.600 alt/h (3 Hz) |
| Power reserve | 80 horas |
| Jewels | 25 |
| Diameter | 42 mm |
| Thickness | 11 mm |
| Lug to lug | 53 mm |
| Lug width | 22 mm |
| Case | Acero inoxidable |
| Crystal | Zafiro |
| Water resistance | 10 bar (100 m) |
IdentificationHow to tell it apart
First check is the seconds hand. Go at it with a loupe: Eureka runs along the hand in morse, lacquer over steel. If a seller offers you a 42 mm as a Murph and that printing isn't there, something doesn't add up — ask for more photographs before you take the purchase any further.
The case is 42 mm across, 11 mm tall and 53 mm lug to lug, with 22 mm lugs, and the back is glazed: you can watch the H-10's rotor turning. A Murph with a solid case back is not this watch. The dial is black, with cream Arabic numerals, cathedral hands carrying beige faux-aged lume, and the KHAKI / AUTOMATIC double line stepped below the centre.
Take care not to mix it up with an ordinary Khaki Field Auto, which shares the family and the calibre but uses different hands and different type. Plenty of Khaki Field Autos have a date window; the Murph has none. The dial is clean from edge to edge, and that cleanliness is much of why it works visually despite 42 mm of case.
CollectingWhat collectors check
This is regular production, not a limited edition, so you aren't buying rarity here — you're buying condition. Hold the case under raking light and look for rounded lug edges, the signature of aggressive polishing and the one thing you can't get back. And use the display back, which on this model is a free inspection window: the rotor should spin freely and quietly, with no rubbing as you tilt the watch.
The black leather strap with cream stitching tires quickly: it dries out beside the buckle and deforms at the keepers. A worn one is no disaster, since 22 mm is an easy size to replace, but it does give you something to haggle over. With sapphire and a hundred metres on the dial, this is a Murph people genuinely wear, and that shows up on straps long before it shows on the case.
Before you pay, swing it to wind it and check the seconds hand starts without a lurch; then set it down and see whether the reserve really gets near eighty hours. The H-10 is dependable, but an example that has sat in a drawer for years with dried lubricant gives away its missed service on day one. Always ask when it was last serviced.
Common questionsWhat people ask us about this reference
Is this exactly the Interstellar watch?
Not exactly. The film watch was a prop built by Hamilton alongside Christopher Nolan and Nathan Crowley. The production model arrived in 2019, based on it, with the Eureka morse detail added.
Where is the morse code message on the Hamilton Murph?
Lacquered onto the central seconds hand, running along its length. It's small enough to vanish at arm's length: you need a watchmaker's loupe to read it.
Murph in 42 mm or 38 mm?
The 38 is easier on an average wrist; the 42, at 53 mm lug to lug, asks for some forearm. Gear Patrol also points out that the morse wink on the seconds hand belongs to the original 42 alone.
Which movement does the Hamilton Khaki Field Murph use?
The automatic H-10 calibre, with 80 hours of power reserve, 25 jewels and an antimagnetic Nivachron hairspring. You can watch the rotor turn through the display back.
Keep readingWhere to go from here
Close relativesThe ones it gets confused with
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