Some are twist or snap off..We get so many that are pressure back cover.Sometimes it can be done with a knife and there is a small hindge where you can snap it off with a knife so easy but the problem will be putting it back on because you have to snap it back on with pressure and it can only be done with a machine.If it is a twist that should be easy,all you do is put both thumbs around the lid and press and twist to the right and it should open.This lid should close tight after you put the battery or the water will get into the watch and damage the watch mechanism.
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