Few prop choices in science-fiction cinema have aged as well as the double Casio F-100 strapped to Sigourney Weaver's wrist in Ridley Scott's 1979 film Alien. Rather than commissioning a bespoke futuristic timepiece, the production's wardrobe department connected two standard-issue Casio F-100 units with a length of orange rubber, creating a wrist-worn instrument cluster that read as entirely plausible in the film's grimy, industrial vision of deep space.
The Casio F-100 launched in 1978, slotting into the Japanese manufacturer's early push into LCD digital technology. The watch runs a basic quartz module with a single-line liquid crystal display delivering time, calendar, alarm, and a rudimentary stopwatch. The case is lightweight resin, the bracelet a simple rubber strap, and the overall footprint is compact by any era's standards. It was priced for mass-market accessibility — a functional tool watch with zero pretension, which is precisely what made it convincing on a working-class space freighter like the Nostromo.
For collectors, the F-100 occupies a specific and growing niche: film-prop watches that require no suspension of disbelief because they are, genuinely, period-correct objects. The double-watch configuration seen in Alien is not a replica or a custom build — it is two production F-100s joined by practical hardware. That fidelity to the original has driven sustained collector interest, particularly among vintage Casio enthusiasts and sci-fi memorabilia collectors who overlap more than you might expect.
Sigourney Weaver's Ellen Ripley remains one of cinema's most enduring protagonists, and every costume detail has been scrutinized accordingly. The F-100 pairing has become one of the most referenced prop watches in film history, discussed in the same breath as the Seiko worn by James Bond or the Hamilton Ventura in Men in Black. Wardrobe brevity became canonical iconography.
On the current grey market, a single Casio F-100 in good condition commands between $500 and $800 — a remarkable premium over its original retail price of a few dollars. Pairs in the Alien configuration fetch considerably more. Casio has never officially reissued the F-100, which keeps supply tight and collector appetite steady.
