The world is divided into 24 time zones. For easy reference in communications, a letter of the alphabet has been assigned to each time zone (less the letter "I" and "O"). The "clock" at Greenwich, England is used as the standard clock for international reference of time in communications, military, maritime and other activities that cross time zones. The letter designation for this clock is Z, pronounced ZULU in the phonetic alphabet.

The T4 uses a turning internal bezel to mark a different time zone (dual time).

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