The 3 key holes are for strike-time-chime. If it is an 8 day you should wind it up after 7 days. Move the hour hand to the number on how many strikes you counted. Then correct the time. If you wind it up, you should have the wind up key. put it on one of the holes. then turn counterclockwise. It will stop when fully wound. Do not overwind it. might broke.
David, June 2010