Seiko Diamatic Day Date Automatic Watch No:...

I have a Seiko Diamatic 780632. To set the day and date, pull the crown once and wind it upwards (away from you) to set the date; winding it downwards (towards you) will set the day. To set the time, you have to pull the crown twice and wind it towards you.

I have a Seiko Diamatic purchased in 1974. While I have not used it for many years, I seem to recall that to change the day and date, you pulled the crown half way out. To change the day, you twisted the crown one direction (not sure if clockwise or anticlockwise) and to change the date, to twisted it in the opposite direction.

Hope this helps.... Regards John T