User:George Swan/sandbox/Casio F91W

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(CC) Image: George Swan
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The Casio F91W is an inexpensive model of digital watch, manufactured by the Japanese firm Casio.[1][2][3][4] It has a daily alarm, that can trigger an audible chirp.

This model of watch is notable because United States intelligence officials have identified it as the watch that terrorists use when constructing timebombs. Ahmed Ressam, the millennial bomber, bought two Casio F91W,[5]

When the Department of Defense was forced to comply with US District Court justice Jed Rakoff's court order to release the documents from Guantanamo detainees' Combatant Status Review Tribunals it became known that the allegations against approximately one dozen of the Guantanamo detainees justified their continued detention because they had been wearing this model of watch, when captured.[6]

Casio officials declined to be interviewed about the U.S. intelligence accusations.[5] But Casio did issue a statement, where they said the watch "has no exclusive technology," and, "Casio continues to work closely with all government agencies, including the Department of Homeland Security to help limit any potential threats and deal with security concerns."

Detainees who testified to their surprise and confusion over this allegation have described their watches, and those descriptions have not matched the description of the F91W. Their descriptions have mentioned built-in compasses and calculators -- features the F91W lacks.

As of March 2008 it is known that over two dozen Guantanamo captives had their ownership of Casio watch offered as a meaningful justification for their continued detention.


  1. Ben Fox. Casio watch is terror 'evidence' at Guantanamo: U.S. cases against at least 8 detainees cite the timepieces, Seattle Post Intelligencer, March 10 2006. Retrieved on 2007-10-20.
  2. Corine Hegland. Empty Evidence, National Journal, Friday, February 3 2006. Retrieved on 2007-10-20.
  3. Keeps on tickin', Harpers magazine, September 2005. Retrieved on 2007-10-20.
  4. Toni Locy. Detainees' cases show another side of Gitmo, USA Today, November 3 2004. Retrieved on 2007-10-20.
  5. 5.0 5.1 Guantanamo Captives Jailed Because Of Digital Watches, WCVB, March 10 2006
  6. Guantanamo: what you need to know, Alternet