Find watch numbers, seamaster automatic

Depends on the watch. A perpetual calendar needs some one who knows how as it is a set combination of buttons to push on the movement. A Omega seamaster there is a button on the crown you need to push in for a few second and the second hand will stop, this is complicated to explain. O normal watch just pull the crown out on stop to change the date/day 2 stops to change the time.

Here is a video that will help you ,if theres no screw it will be a small button that you press bown on then pull crown out,,

Your watch uses a calibre 1665 movement. You might contact After Sales Service and ask them if they would send you an owners manual. Setting the time and date is fairly straight forward but you also need to sync the analog and digital displays so it is a bit difficult to describe in just a few words.

The basic guideline is
To select function - turn the crown
To change function - pull out the crown and then turn it
To start and stop functions - press the crown

it would cost around 45 dollars for a generic stem and crown. that would fit that movement . to be installed.

To remove the stem you must first loosen the set lever screw, then you can pull the stem out.
You only need to turn the set lever screw a couple turns to release the stem. Some movements use a button instead and in that case you would simply push the button down lightly with a pointed tool and while holding the button down pull the stem out.
For watches with one-piece cases where the movement comes out the dial side and the case has no removable back, you will not be able to get at the set lever screw. For this type of watch you must grasp the crown firmly and pull it out, or use plastic or soft brass tweezers to get behind the crown and pop it off. These watches have two-piece stems that have male and female ends that snap together. Then remove the bezel and let the movement come out into your hands. Then remove the hands and the dial and put the movement face down into a movement holder.

seamasters are ment for deep driving so try unscrewing the crown first

The crown on the left side is HELIUM VALVE and is designed for compensating and keeping the right air pressure inside watch case if it is used for diving purposes.
If you will try to set something using this crown, nothing will happen, as it has special springs, gaskets and bars built into it, but has no any connection with watch movement.

Do not forget to rate, please.

Kris,
The only way to find out what model of Omega you actually own is to open it.  This should have been done by whoever you already brought it to.  Omega only prints their model #'s on the movement inside the watch.  If you open the watch, look on the movement, you'll know what model you own.

Hi, on the back of the movement there should either be a screw or a dimple in line or next to the line of the stem. If a dimple, press in with a pin or similar sturdy tool and gently withdraw the stem. If a screw, only one turn should be enough to release the stem

sounds like an auto wind watch,you must wear this watch most of the day to keep it wound up.to wind the crown must be pushed all the way in.