Watch back removal

Dale, I used to do a lot of watches, the following is the technique
I found most successful, but no guarantees offered.

Use a sharp pocket knife and a 3" x 3" piece of leather. Watch
crystal down on leather in (left for a right handed person) palm with
‘groove’ towards fingers. Squeeze the knife into groove HARD, twist
knife. The leather protects your hand against accidents and enables
you to squeeze harder. BE confident - no tentative uncertain half
measures or you will fail and scratch the watch. Also first check for
screw on back, you’ll feel really foolish popping one of them ;-(

Jeff Demand