I was going nuts trying to open the back of a watch to change the battery . Nothing I had could seem to fit that tiny lip on the back of that watch . Still searching I dug out this tiny Buck pen knife .
opened the short blunt blade fitted it to the aggravating lip and ” click” it was open .
I use that little knife to fit the pins on a watch to hold the bands . I keep that tiny knife sharp though I never skinned anything with it .But it could if I needed too.
That little knife is a tool…

Buck pen knife