The Omega Memomatic Seamaster watch has an automatic feature for both its alarm and calendar. It consists of a three-position control button and a two-position winding crown. Hand winding for time keeping and the alarm are not necessary unless you haven't worn the watch for 48 hours or longer or unless you wish to use the alarm again less than one hour after it was last used. The date will change itself at midnight on a daily basis so it only needs an adjustment for months that have fewer than 31 days.
Press the upper control button on the right-hand side of the watch to stop the alarm. It should ring for eight to 10 seconds. The upper button is the control button and the lower button is called the winding crown.
Set the alarm by pulling out the winding crown and turning the winding crown backward to the time you wish the alarm to go off at. Push the winding crown back. The alarm should ring within one to three minutes of the set time.
Change the date by pushing the recessed reset button in until you reach the desired date. This button is located between the control button and the winding crown. You will need to use a sharp object such as a ballpoint pen to push it in properly.
Pull the winding crown out and turn the winding crown in either direction to the correct time. Push the winding crown back in to its original position.
Check to see that the winding crown is pushed in close to the watch case itself as this ensures that the watch will be water-resistant.
There are many models of Omega Seamaster watches. If you do not have a manual for your specific model, you can go to Omega's website for a manual or contact them for a manual. That is the only way to be sure you have the right instructions for your particular model. The manuals come with illustrations.