Briefing documents used to train staff in assessing the threat level of new detainees advise that possession of the F-91W - available online for as little as £4 - suggests the wearer has been trained in bomb making by al-Qaida in Afghanistan.
The report states: "The Casio was known to be given to the students at al-Qaida bomb-making training courses in Afghanistan at which the students received instruction in the preparation of timing devices using the watch.
According to a now-deleted Wikipedia article:
Because of its claimed use in terrorism, possession of a Casio watch, often a Casio F91W, was listed in Guantanamo Bay Combatant Status Review Tribunal reports and other government documents as a reason for these detainees’ continued detention.
An improvised timer for a time bomb captured in the early 2000s. Via Wikipedia
Reach this writer at firstname.lastname@example.org.