Raymond Weil Mеханические с автоподзаводом, индикацией лунных фаз, месяца, номера недели, дня недели и даты - Manual (Page 14)

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Rapid adjustment of the day of the week
With the crown in position (I) press
button
C
until the desired day is
indicated by hand 6.
N.B. At the change from Sunday to
Monday, the week number hand 7
advances by a unit.
Rapid adjustment of the week number
With the crown in position (I) press
button
D
until the desired number
is indicated by hand 7.