Citizen 8651 Manual page 6

Month Correction Button:
The month correction button is located at the 3:00 position. There are two types of
the month correction buttons. One is a screw lock type and the other is a recessed
type. Be sure to refer to the section that applies to your button type. Identification can
be made as follows:
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Screw lock type button
Recessed type button
Screw lock type button
The screw lock type button has a flat smooth end that protrudes slightly from the end
of the screw lock.
The recessed button type has a dimpled appearance at the end.
In the case the month correction button is of the screw lock type, operate the month
correction after first turning the "button cover" around the outside of the button to
the left to loosen the screw. The button is unable to operate properly if the screw is
not adequately loosened. Once you have finished operating the month correction
button, turn the "button cover" to the right and tighten securely. Please note that
if the button cover is not adequately tightened, the button may be bent or it may be
accidentally depressed while wearing the watch causing the month to be changed
inadvertently.
Recessed type button
The month is changed by simply pressing and releasing the recessed button with a
narrow pointed object. There is no screw lock mechanism to release for this type.
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