Purchased to replace the battery in my (waterproof) Invicta dive watch. Removing the back and replacing the battery is easy enough, but you'll need to make sure you lubricate the o-ring before screwing on the back so it seals properly. This lube did its job. I'm taking off a star because it's both expensive and lots of lube, but it was the only thing I could find that got me when I wanted it. In short, it works.
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