Pocket Watch from Japan

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My wife’s family gave me this pocket watch that could be from her grandfather or great grandfather. I’m not sure what kind this is. Anyone have an idea?
 
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Have you had a look inside yet?
No I haven’t. I don’t know how nor am sure if it would be okay to since I’ve never had a watch.

Do I just pop the back open and after, close it?
 
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It looks like a screw back. But take no chances, ask a local watchmaker to open it.