Just finished up this repair, a classic 1972 model in need of much TLC.
Here is the before and After, followed by how I got there.
and this is how I got there - pop the case off and unscrew the set lever screw about 2.5 turns.
out comes the movement and the tear down begins. While doing so I see the crystal will have to be replaced as well as the crown\stem.
I also spot an oil spill on the date ring, this means someone has been in here before and did not