I have the same problem. I can set the time by pulling the stem out. Supposedly, there is a middle stop on the stem that will set the date, but I cannot get it to work. more...
Your Omega Speedmaster has a three setting button,the two is for push button, and the
center button is to half pull and full pull , the half pull is for
the date setting and the full pull is for the hour and minutes.When more...