Hey there !
if the back has a notch on the top left of the cover (right underneath to what would be 10'oclock position), it is a 'Pop-up'. But if the watch has 6-8 notches on the back plate of the watch its a screw-off.
Its really hard to say what battery size it would take due to the fact that each watch has a different operating mechanism and its hard to determine that from the model number.
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