You must first determine if the watch has a screw down back or snap off back.The top picture is a scre down back and the bottom is a snap off. If it is a screw down back you will need a watch case back opener to open. If is is a snap off you need to look around the back and find the little notch. you can then take something like a butter knife insert the edge between the case back and the case and snap the back off.
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