Opening A Wristwatch Case

How to open a WristWatch ..??
Hello, I need to replace the battery in my watch, but it is incredibly difficult to do the trick off! It's one of those who watch analog (back) a hermetic "lid" with a small raised "lip" which I assume is used to lift, but the gap he leaves enough room for Exacto blade that snaps right: (someone help PLEASE me, I need a way to get this case off! Thank you a billion! Christie
a glue gun. reheat, put in the back of the watch, wait for it to cool and then gently pull it off. ~ ~ Or a knife
The Curious Case of Benjamin Button | Promotional Wrist Watch