procedure to change the casio F-91W between 12-hour and 24-hour mode

The Casio F-91W can go into 12h mode by mistake, because the button to change it is on the hand side.

To change it back, just press the "Alarm on-off/24hr" button, which is the one in the bottom-right.

Better design would be to have 24-hour mode only.  Silly settings do not need to be settable or possible.

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